背景
IERS（International Earth Rotation Service）即国际地球自转服务，于1988年由国际大地测量学和地球物理学联合会（International Union of Geodesy and Geophysics)与国际天文学联合会（International Astronomical Union，缩写为IAU）共同建立，用以取代国际时间局（BIH）的地球自转部分和原有的国际极移服务（IPMS），于1988年1月1日正式开始运作。
网址如下：
https://www.iers.org/IERS/EN/Home/home_node.html
https://www.iers.org/IERS/EN/Home/home_node.html
IERS公报
IERS公报Bulletins为IERS发布的地球指向数据（Earth Orientation Data）。如下所示：
Bulletin A
提供地球自转相关参数，每周发布一次(weekly)每日参数。包含如下4中参数：
（1）综合参数。General information including key definitions and the most recently adopted values of DUT1 and TAI-UTC.
（2）EOP信息。Quick-look daily estimates of the EOPs determined by smoothing the observed data. This involves the application of systematic corrections and statistical weighting. The results are published with a delay of about one to three days between the date of publication and the last available date with estimated EOP.
（3）极移参数预测。Predictions of x, y, and UT1-UTC, up to 365 days following the last day of data. The predictions use similar algorithms based on seasonal filtering and autoregressive processing for x, y, and UT1.
（4）极移级数的系数。The combination series for the celestial pole offsets. Bulletin A contains celestial pole offsets with respect to the IAU1980 Nutation theroy (dpsi and deps) and the IAU 2000 Resolutions (dX and dY), beginning on 1 January 2003.
最新信息如下：
**********************************************************************
* *
* I E R S B U L L E T I N - A *
* *
* Rapid Service/Prediction of Earth Orientation *
**********************************************************************
18 November 2021 Vol. XXXIV No. 046
______________________________________________________________________
GENERAL INFORMATION:
To receive this information electronically, contact:
ser7@maia.usno.navy.mil or use
MJD = Julian Date - 2 400 000.5 days
UT2-UT1 = 0.022 sin(2*pi*T) - 0.012 cos(2*pi*T)
- 0.006 sin(4*pi*T) + 0.007 cos(4*pi*T)
where pi = 3.14159265... and T is the date in Besselian years.
TT = TAI + 32.184 seconds
DUT1= (UT1-UTC) transmitted with time signals
= -0.1 seconds beginning 17 July 2021 at 0000 UTC
Beginning 1 January 2017:
TAI-UTC = 37.000 000 seconds
***********************************************************************
* *
* There will NOT be a leap second introduced *
* in UTC at the end of Dec 2021 *
* *
* The US Naval Observatory's Rapid Service/Prediction Center website *
* (maia.usno.navy.mil) must undergo modernization and has been *
* offline since 24 October 2019. The expected completion of work and *
* return of service will be no earlier than Summer of 2021. *
* *
* Although the Bulletin A makes several references to maia, the *
* paragraph above supersedes any information contained in the *
* Bulletin A text. *
* *
* Updated EOPs are available at NASA's Archive of Space Geodesy Data: *
* https://cddis.nasa.gov/archive/products/iers *
* ftps://gdc.cddis.eosdis.nasa.gov/products/iers *
* Daily EOP data may be available here by 18:00 UTC, and Bulletin A *
* EOP data may be available by 20:00 UTC. *
* For additional information on accessing CDDIS, please refer to: *
* https://cddis.nasa.gov/About/CDDIS_File_Download_FAQ.html *
* *
* Updated EOPs may also be available at IERS: *
* https://datacenter.iers.org/eop.php *
* EOP data files are uploaded directly from USNO to this site each *
* day. For further information, contact the IERS directly. *
* *
* Users should verify results obtained from these sites; we cannot *
* guarantee the integrity or timeliness of files provided at *
* third-party sites. *
* *
* Questions and enquiries about EOPs can be emailed to the *
* following address: *
* usn.ncr.navobsydc.mbx.eopcp@mail.mil *
* Due to ongoing email issues, please CC *
* navobsy_eop.fct@navy.mil *
* until further notice. *
* *
* Starting on the 18 Nov 2021, new versions of the USNO VLBI *
* solutions (usn2021c.eoxy and usn2021c.eopi) are being used. *
* The effect appears to be less than 0.1 mas in polar motion and *
* 10 us in UT1-UTC. *
* *
* Distribution statement A. *
* Approved for public release: distribution unlimited. *
* *
***********************************************************************
________________________________________________________________________
The contributed observations used in the preparation of this Bulletin
are available at . The contributed analysis results are based
on data from Very Long Baseline Interferometry (VLBI), Satellite Laser
Ranging (SLR), the Global Positioning System (GPS) satellites, Lunar
Laser Ranging (LLR), and meteorological predictions of variations in
Atmospheric Angular Momentum (AAM).
________________________________________________________________________
COMBINED EARTH ORIENTATION PARAMETERS:
IERS Rapid Service
MJD x error y error UT1-UTC error
" " " " s s
21 11 12 59530 0.14852 .00009 0.24659 .00009 -0.106946 0.000014
21 11 13 59531 0.14774 .00009 0.24648 .00009 -0.107249 0.000016
21 11 14 59532 0.14695 .00009 0.24644 .00009 -0.107641 0.000014
21 11 15 59533 0.14563 .00009 0.24631 .00009 -0.108004 0.000010
21 11 16 59534 0.14361 .00009 0.24596 .00009 -0.108268 0.000010
21 11 17 59535 0.14152 .00009 0.24546 .00009 -0.108455 0.000009
21 11 18 59536 0.13974 .00009 0.24510 .00009 -0.108526 0.000055
_______________________________________________________________________
PREDICTIONS:
The following formulas will not reproduce the predictions given below,
but may be used to extend the predictions beyond the end of this table.
x = 0.1471 + 0.0368 cos A - 0.1033 sin A - 0.0408 cos C - 0.0194 sin C
y = 0.3549 - 0.0904 cos A - 0.0403 sin A - 0.0194 cos C + 0.0408 sin C
UT1-UTC = -0.1168 + 0.00021 (MJD - 59544) - (UT2-UT1)
where A = 2*pi*(MJD-59536)/365.25 and C = 2*pi*(MJD-59536)/435.
TAI-UTC(MJD 59537) = 37.0
The accuracy may be estimated from the expressions:
S x,y = 0.00068 (MJD-59536)**0.80 S t = 0.00025 (MJD-59536)**0.75
Estimated accuracies are: Predictions 10 d 20 d 30 d 40 d
Polar coord's 0.004 0.007 0.010 0.013
UT1-UTC 0.0014 0.0024 0.0032 0.0040
MJD x(arcsec) y(arcsec) UT1-UTC(sec)
2021 11 19 59537 0.1380 0.2449 -0.10844
2021 11 20 59538 0.1362 0.2448 -0.10816
2021 11 21 59539 0.1345 0.2447 -0.10772
2021 11 22 59540 0.1327 0.2448 -0.10718
2021 11 23 59541 0.1308 0.2448 -0.10658
2021 11 24 59542 0.1289 0.2449 -0.10597
2021 11 25 59543 0.1270 0.2449 -0.10541
2021 11 26 59544 0.1251 0.2450 -0.10498
2021 11 27 59545 0.1233 0.2451 -0.10473
2021 11 28 59546 0.1215 0.2452 -0.10472
2021 11 29 59547 0.1195 0.2455 -0.10494
2021 11 30 59548 0.1175 0.2457 -0.10533
2021 12 1 59549 0.1155 0.2460 -0.10580
2021 12 2 59550 0.1135 0.2463 -0.10625
2021 12 3 59551 0.1114 0.2466 -0.10657
2021 12 4 59552 0.1094 0.2470 -0.10665
2021 12 5 59553 0.1075 0.2474 -0.10649
2021 12 6 59554 0.1056 0.2478 -0.10614
2021 12 7 59555 0.1036 0.2483 -0.10573
2021 12 8 59556 0.1017 0.2488 -0.10540
2021 12 9 59557 0.0998 0.2493 -0.10522
2021 12 10 59558 0.0979 0.2499 -0.10521
2021 12 11 59559 0.0960 0.2504 -0.10533
2021 12 12 59560 0.0940 0.2510 -0.10551
2021 12 13 59561 0.0922 0.2516 -0.10569
2021 12 14 59562 0.0903 0.2523 -0.10580
2021 12 15 59563 0.0884 0.2530 -0.10580
2021 12 16 59564 0.0866 0.2537 -0.10563
2021 12 17 59565 0.0847 0.2544 -0.10529
2021 12 18 59566 0.0829 0.2552 -0.10477
2021 12 19 59567 0.0811 0.2560 -0.10412
2021 12 20 59568 0.0793 0.2568 -0.10337
2021 12 21 59569 0.0775 0.2576 -0.10260
2021 12 22 59570 0.0758 0.2585 -0.10187
2021 12 23 59571 0.0741 0.2594 -0.10123
2021 12 24 59572 0.0723 0.2603 -0.10076
2021 12 25 59573 0.0706 0.2613 -0.10048
2021 12 26 59574 0.0689 0.2622 -0.10042
2021 12 27 59575 0.0672 0.2632 -0.10054
2021 12 28 59576 0.0656 0.2643 -0.10078
2021 12 29 59577 0.0639 0.2653 -0.10102
2021 12 30 59578 0.0623 0.2664 -0.10116
2021 12 31 59579 0.0607 0.2675 -0.10109
2022 1 1 59580 0.0591 0.2686 -0.10076
2022 1 2 59581 0.0575 0.2698 -0.10024
2022 1 3 59582 0.0560 0.2710 -0.09962
2022 1 4 59583 0.0544 0.2722 -0.09904
2022 1 5 59584 0.0529 0.2734 -0.09860
2022 1 6 59585 0.0514 0.2746 -0.09836
2022 1 7 59586 0.0499 0.2759 -0.09830
2022 1 8 59587 0.0485 0.2772 -0.09836
2022 1 9 59588 0.0471 0.2785 -0.09844
2022 1 10 59589 0.0456 0.2799 -0.09847
2022 1 11 59590 0.0443 0.2812 -0.09839
2022 1 12 59591 0.0429 0.2826 -0.09815
2022 1 13 59592 0.0416 0.2840 -0.09775
2022 1 14 59593 0.0403 0.2855 -0.09718
2022 1 15 59594 0.0390 0.2869 -0.09647
2022 1 16 59595 0.0377 0.2884 -0.09567
2022 1 17 59596 0.0365 0.2899 -0.09483
2022 1 18 59597 0.0353 0.2914 -0.09405
2022 1 19 59598 0.0341 0.2929 -0.09337
2022 1 20 59599 0.0329 0.2945 -0.09288
2022 1 21 59600 0.0318 0.2960 -0.09260
2022 1 22 59601 0.0307 0.2976 -0.09256
2022 1 23 59602 0.0296 0.2992 -0.09271
2022 1 24 59603 0.0286 0.3008 -0.09299
2022 1 25 59604 0.0275 0.3025 -0.09332
2022 1 26 59605 0.0265 0.3041 -0.09359
2022 1 27 59606 0.0256 0.3058 -0.09371
2022 1 28 59607 0.0246 0.3075 -0.09363
2022 1 29 59608 0.0237 0.3092 -0.09336
2022 1 30 59609 0.0229 0.3109 -0.09299
2022 1 31 59610 0.0220 0.3126 -0.09263
2022 2 1 59611 0.0212 0.3143 -0.09241
2022 2 2 59612 0.0204 0.3161 -0.09240
2022 2 3 59613 0.0197 0.3179 -0.09261
2022 2 4 59614 0.0189 0.3196 -0.09299
2022 2 5 59615 0.0183 0.3214 -0.09344
2022 2 6 59616 0.0176 0.3232 -0.09388
2022 2 7 59617 0.0170 0.3250 -0.09421
2022 2 8 59618 0.0164 0.3268 -0.09439
2022 2 9 59619 0.0158 0.3287 -0.09440
2022 2 10 59620 0.0153 0.3305 -0.09422
2022 2 11 59621 0.0148 0.3324 -0.09390
2022 2 12 59622 0.0143 0.3342 -0.09346
2022 2 13 59623 0.0139 0.3361 -0.09299
2022 2 14 59624 0.0135 0.3380 -0.09254
2022 2 15 59625 0.0131 0.3398 -0.09220
2022 2 16 59626 0.0128 0.3417 -0.09203
2022 2 17 59627 0.0125 0.3436 -0.09208
2022 2 18 59628 0.0122 0.3455 -0.09236
2022 2 19 59629 0.0120 0.3474 -0.09285
2022 2 20 59630 0.0118 0.3493 -0.09348
2022 2 21 59631 0.0116 0.3512 -0.09416
2022 2 22 59632 0.0115 0.3531 -0.09478
2022 2 23 59633 0.0114 0.3550 -0.09524
2022 2 24 59634 0.0113 0.3570 -0.09550
2022 2 25 59635 0.0113 0.3589 -0.09556
2022 2 26 59636 0.0113 0.3608 -0.09549
2022 2 27 59637 0.0113 0.3627 -0.09539
2022 2 28 59638 0.0114 0.3646 -0.09538
2022 3 1 59639 0.0115 0.3665 -0.09557
2022 3 2 59640 0.0116 0.3685 -0.09601
2022 3 3 59641 0.0118 0.3704 -0.09666
2022 3 4 59642 0.0120 0.3723 -0.09744
2022 3 5 59643 0.0122 0.3742 -0.09826
2022 3 6 59644 0.0125 0.3761 -0.09902
2022 3 7 59645 0.0128 0.3780 -0.09955
2022 3 8 59646 0.0131 0.3799 -0.09990
2022 3 9 59647 0.0135 0.3818 -0.10006
2022 3 10 59648 0.0139 0.3837 -0.10005
2022 3 11 59649 0.0143 0.3856 -0.09991
2022 3 12 59650 0.0148 0.3875 -0.09970
2022 3 13 59651 0.0153 0.3893 -0.09949
2022 3 14 59652 0.0158 0.3912 -0.09935
2022 3 15 59653 0.0164 0.3931 -0.09936
2022 3 16 59654 0.0170 0.3949 -0.09957
2022 3 17 59655 0.0177 0.3967 -0.10003
2022 3 18 59656 0.0183 0.3986 -0.10071
2022 3 19 59657 0.0190 0.4004 -0.10157
2022 3 20 59658 0.0198 0.4022 -0.10250
2022 3 21 59659 0.0205 0.4040 -0.10338
2022 3 22 59660 0.0213 0.4058 -0.10410
2022 3 23 59661 0.0222 0.4076 -0.10459
2022 3 24 59662 0.0230 0.4093 -0.10485
2022 3 25 59663 0.0239 0.4111 -0.10494
2022 3 26 59664 0.0248 0.4128 -0.10495
2022 3 27 59665 0.0258 0.4145 -0.10500
2022 3 28 59666 0.0268 0.4163 -0.10521
2022 3 29 59667 0.0278 0.4179 -0.10562
2022 3 30 59668 0.0288 0.4196 -0.10625
2022 3 31 59669 0.0299 0.4213 -0.10705
2022 4 1 59670 0.0310 0.4229 -0.10791
2022 4 2 59671 0.0322 0.4246 -0.10874
2022 4 3 59672 0.0333 0.4262 -0.10946
2022 4 4 59673 0.0345 0.4278 -0.11000
2022 4 5 59674 0.0357 0.4294 -0.11034
2022 4 6 59675 0.0370 0.4309 -0.11047
2022 4 7 59676 0.0383 0.4325 -0.11045
2022 4 8 59677 0.0396 0.4340 -0.11032
2022 4 9 59678 0.0409 0.4355 -0.11014
2022 4 10 59679 0.0423 0.4370 -0.11001
2022 4 11 59680 0.0436 0.4385 -0.10998
2022 4 12 59681 0.0450 0.4399 -0.11012
2022 4 13 59682 0.0465 0.4413 -0.11048
2022 4 14 59683 0.0479 0.4427 -0.11107
2022 4 15 59684 0.0494 0.4441 -0.11187
2022 4 16 59685 0.0509 0.4455 -0.11278
2022 4 17 59686 0.0525 0.4468 -0.11370
2022 4 18 59687 0.0540 0.4481 -0.11447
2022 4 19 59688 0.0556 0.4494 -0.11501
2022 4 20 59689 0.0572 0.4507 -0.11527
2022 4 21 59690 0.0588 0.4519 -0.11531
2022 4 22 59691 0.0605 0.4531 -0.11522
2022 4 23 59692 0.0621 0.4543 -0.11513
2022 4 24 59693 0.0638 0.4555 -0.11514
2022 4 25 59694 0.0655 0.4566 -0.11532
2022 4 26 59695 0.0673 0.4577 -0.11570
2022 4 27 59696 0.0690 0.4588 -0.11623
2022 4 28 59697 0.0708 0.4599 -0.11684
2022 4 29 59698 0.0726 0.4609 -0.11744
2022 4 30 59699 0.0744 0.4619 -0.11794
2022 5 1 59700 0.0762 0.4629 -0.11828
2022 5 2 59701 0.0780 0.4639 -0.11842
2022 5 3 59702 0.0799 0.4648 -0.11834
2022 5 4 59703 0.0818 0.4657 -0.11807
2022 5 5 59704 0.0837 0.4665 -0.11766
2022 5 6 59705 0.0856 0.4674 -0.11718
2022 5 7 59706 0.0875 0.4682 -0.11669
2022 5 8 59707 0.0894 0.4690 -0.11627
2022 5 9 59708 0.0914 0.4697 -0.11598
2022 5 10 59709 0.0933 0.4705 -0.11589
2022 5 11 59710 0.0953 0.4712 -0.11600
2022 5 12 59711 0.0973 0.4718 -0.11633
2022 5 13 59712 0.0993 0.4724 -0.11683
2022 5 14 59713 0.1013 0.4731 -0.11738
2022 5 15 59714 0.1033 0.4736 -0.11787
2022 5 16 59715 0.1053 0.4742 -0.11817
2022 5 17 59716 0.1074 0.4747 -0.11821
2022 5 18 59717 0.1094 0.4752 -0.11800
2022 5 19 59718 0.1115 0.4756 -0.11763
2022 5 20 59719 0.1135 0.4760 -0.11723
2022 5 21 59720 0.1156 0.4764 -0.11694
2022 5 22 59721 0.1177 0.4768 -0.11683
2022 5 23 59722 0.1197 0.4771 -0.11694
2022 5 24 59723 0.1218 0.4774 -0.11725
2022 5 25 59724 0.1239 0.4777 -0.11766
2022 5 26 59725 0.1260 0.4779 -0.11810
2022 5 27 59726 0.1281 0.4781 -0.11846
2022 5 28 59727 0.1302 0.4783 -0.11867
2022 5 29 59728 0.1323 0.4784 -0.11867
2022 5 30 59729 0.1344 0.4785 -0.11842
2022 5 31 59730 0.1365 0.4786 -0.11796
2022 6 1 59731 0.1386 0.4786 -0.11732
2022 6 2 59732 0.1407 0.4786 -0.11658
2022 6 3 59733 0.1428 0.4786 -0.11582
2022 6 4 59734 0.1450 0.4785 -0.11512
2022 6 5 59735 0.1471 0.4784 -0.11453
2022 6 6 59736 0.1492 0.4783 -0.11411
2022 6 7 59737 0.1513 0.4782 -0.11388
2022 6 8 59738 0.1534 0.4780 -0.11383
2022 6 9 59739 0.1555 0.4778 -0.11394
2022 6 10 59740 0.1575 0.4775 -0.11414
2022 6 11 59741 0.1596 0.4772 -0.11431
2022 6 12 59742 0.1617 0.4769 -0.11431
2022 6 13 59743 0.1638 0.4766 -0.11405
2022 6 14 59744 0.1658 0.4762 -0.11347
2022 6 15 59745 0.1679 0.4758 -0.11262
2022 6 16 59746 0.1700 0.4754 -0.11161
2022 6 17 59747 0.1720 0.4749 -0.11059
2022 6 18 59748 0.1740 0.4744 -0.10968
2022 6 19 59749 0.1761 0.4739 -0.10894
2022 6 20 59750 0.1781 0.4733 -0.10835
2022 6 21 59751 0.1801 0.4727 -0.10784
2022 6 22 59752 0.1821 0.4721 -0.10735
2022 6 23 59753 0.1840 0.4715 -0.10681
2022 6 24 59754 0.1860 0.4708 -0.10618
2022 6 25 59755 0.1880 0.4701 -0.10539
2022 6 26 59756 0.1899 0.4693 -0.10443
2022 6 27 59757 0.1918 0.4686 -0.10330
2022 6 28 59758 0.1937 0.4678 -0.10200
2022 6 29 59759 0.1956 0.4669 -0.10051
2022 6 30 59760 0.1975 0.4661 -0.09895
2022 7 1 59761 0.1994 0.4652 -0.09747
2022 7 2 59762 0.2013 0.4643 -0.09618
2022 7 3 59763 0.2031 0.4633 -0.09503
2022 7 4 59764 0.2049 0.4624 -0.09408
2022 7 5 59765 0.2067 0.4614 -0.09337
2022 7 6 59766 0.2085 0.4603 -0.09278
2022 7 7 59767 0.2102 0.4593 -0.09231
2022 7 8 59768 0.2120 0.4582 -0.09183
2022 7 9 59769 0.2137 0.4571 -0.09125
2022 7 10 59770 0.2154 0.4560 -0.09045
2022 7 11 59771 0.2171 0.4548 -0.08939
2022 7 12 59772 0.2188 0.4536 -0.08806
2022 7 13 59773 0.2204 0.4524 -0.08664
2022 7 14 59774 0.2220 0.4512 -0.08522
2022 7 15 59775 0.2236 0.4499 -0.08392
2022 7 16 59776 0.2252 0.4487 -0.08290
2022 7 17 59777 0.2267 0.4474 -0.08210
2022 7 18 59778 0.2282 0.4460 -0.08151
2022 7 19 59779 0.2297 0.4447 -0.08093
2022 7 20 59780 0.2312 0.4433 -0.08020
2022 7 21 59781 0.2327 0.4419 -0.07930
2022 7 22 59782 0.2341 0.4405 -0.07820
2022 7 23 59783 0.2355 0.4391 -0.07684
2022 7 24 59784 0.2369 0.4376 -0.07526
2022 7 25 59785 0.2382 0.4361 -0.07347
2022 7 26 59786 0.2395 0.4346 -0.07156
2022 7 27 59787 0.2408 0.4331 -0.06962
2022 7 28 59788 0.2421 0.4316 -0.06767
2022 7 29 59789 0.2433 0.4300 -0.06587
2022 7 30 59790 0.2445 0.4284 -0.06424
2022 7 31 59791 0.2457 0.4268 -0.06283
2022 8 1 59792 0.2468 0.4252 -0.06163
2022 8 2 59793 0.2480 0.4236 -0.06063
2022 8 3 59794 0.2490 0.4220 -0.05973
2022 8 4 59795 0.2501 0.4203 -0.05881
2022 8 5 59796 0.2511 0.4186 -0.05782
2022 8 6 59797 0.2521 0.4169 -0.05673
2022 8 7 59798 0.2531 0.4152 -0.05542
2022 8 8 59799 0.2540 0.4135 -0.05393
2022 8 9 59800 0.2549 0.4118 -0.05237
2022 8 10 59801 0.2558 0.4100 -0.05082
2022 8 11 59802 0.2567 0.4083 -0.04941
2022 8 12 59803 0.2575 0.4065 -0.04822
2022 8 13 59804 0.2582 0.4047 -0.04729
2022 8 14 59805 0.2590 0.4029 -0.04661
2022 8 15 59806 0.2597 0.4011 -0.04607
2022 8 16 59807 0.2604 0.3993 -0.04555
2022 8 17 59808 0.2610 0.3974 -0.04495
2022 8 18 59809 0.2616 0.3956 -0.04417
2022 8 19 59810 0.2622 0.3938 -0.04317
2022 8 20 59811 0.2628 0.3919 -0.04201
2022 8 21 59812 0.2633 0.3900 -0.04069
2022 8 22 59813 0.2638 0.3882 -0.03915
2022 8 23 59814 0.2642 0.3863 -0.03755
2022 8 24 59815 0.2646 0.3844 -0.03596
2022 8 25 59816 0.2650 0.3825 -0.03444
2022 8 26 59817 0.2653 0.3806 -0.03308
2022 8 27 59818 0.2656 0.3787 -0.03193
2022 8 28 59819 0.2659 0.3768 -0.03097
2022 8 29 59820 0.2661 0.3749 -0.03019
2022 8 30 59821 0.2664 0.3730 -0.02962
2022 8 31 59822 0.2665 0.3711 -0.02916
2022 9 1 59823 0.2667 0.3692 -0.02875
2022 9 2 59824 0.2668 0.3673 -0.02832
2022 9 3 59825 0.2668 0.3653 -0.02777
2022 9 4 59826 0.2669 0.3634 -0.02711
2022 9 5 59827 0.2669 0.3615 -0.02638
2022 9 6 59828 0.2668 0.3596 -0.02563
2022 9 7 59829 0.2667 0.3577 -0.02502
2022 9 8 59830 0.2666 0.3558 -0.02461
2022 9 9 59831 0.2665 0.3538 -0.02446
2022 9 10 59832 0.2663 0.3519 -0.02457
2022 9 11 59833 0.2661 0.3500 -0.02489
2022 9 12 59834 0.2659 0.3481 -0.02530
2022 9 13 59835 0.2656 0.3462 -0.02561
2022 9 14 59836 0.2653 0.3443 -0.02573
2022 9 15 59837 0.2649 0.3424 -0.02563
2022 9 16 59838 0.2645 0.3406 -0.02530
2022 9 17 59839 0.2641 0.3387 -0.02478
2022 9 18 59840 0.2637 0.3368 -0.02413
2022 9 19 59841 0.2632 0.3350 -0.02340
2022 9 20 59842 0.2627 0.3331 -0.02263
2022 9 21 59843 0.2621 0.3313 -0.02187
2022 9 22 59844 0.2616 0.3294 -0.02118
2022 9 23 59845 0.2609 0.3276 -0.02070
2022 9 24 59846 0.2603 0.3258 -0.02046
2022 9 25 59847 0.2596 0.3240 -0.02034
2022 9 26 59848 0.2589 0.3222 -0.02033
2022 9 27 59849 0.2582 0.3204 -0.02045
2022 9 28 59850 0.2574 0.3186 -0.02058
2022 9 29 59851 0.2566 0.3169 -0.02060
2022 9 30 59852 0.2557 0.3151 -0.02046
2022 10 1 59853 0.2549 0.3134 -0.02002
2022 10 2 59854 0.2540 0.3117 -0.01939
2022 10 3 59855 0.2530 0.3100 -0.01867
2022 10 4 59856 0.2521 0.3083 -0.01796
2022 10 5 59857 0.2511 0.3066 -0.01743
2022 10 6 59858 0.2500 0.3050 -0.01714
2022 10 7 59859 0.2490 0.3034 -0.01711
2022 10 8 59860 0.2479 0.3017 -0.01744
2022 10 9 59861 0.2468 0.3001 -0.01791
2022 10 10 59862 0.2457 0.2985 -0.01840
2022 10 11 59863 0.2445 0.2970 -0.01876
2022 10 12 59864 0.2433 0.2954 -0.01887
2022 10 13 59865 0.2421 0.2939 -0.01871
2022 10 14 59866 0.2408 0.2924 -0.01836
2022 10 15 59867 0.2395 0.2909 -0.01787
2022 10 16 59868 0.2382 0.2894 -0.01725
2022 10 17 59869 0.2369 0.2880 -0.01658
2022 10 18 59870 0.2356 0.2865 -0.01595
2022 10 19 59871 0.2342 0.2851 -0.01545
2022 10 20 59872 0.2328 0.2837 -0.01514
2022 10 21 59873 0.2313 0.2824 -0.01506
2022 10 22 59874 0.2299 0.2810 -0.01520
2022 10 23 59875 0.2284 0.2797 -0.01558
2022 10 24 59876 0.2269 0.2784 -0.01613
2022 10 25 59877 0.2254 0.2772 -0.01671
2022 10 26 59878 0.2238 0.2759 -0.01717
2022 10 27 59879 0.2223 0.2747 -0.01745
2022 10 28 59880 0.2207 0.2735 -0.01752
2022 10 29 59881 0.2191 0.2723 -0.01739
2022 10 30 59882 0.2174 0.2712 -0.01713
2022 10 31 59883 0.2158 0.2701 -0.01692
2022 11 1 59884 0.2141 0.2690 -0.01678
2022 11 2 59885 0.2124 0.2679 -0.01679
2022 11 3 59886 0.2107 0.2669 -0.01700
2022 11 4 59887 0.2090 0.2658 -0.01740
2022 11 5 59888 0.2072 0.2649 -0.01795
2022 11 6 59889 0.2055 0.2639 -0.01846
2022 11 7 59890 0.2037 0.2630 -0.01893
2022 11 8 59891 0.2019 0.2621 -0.01926
2022 11 9 59892 0.2001 0.2612 -0.01938
2022 11 10 59893 0.1983 0.2603 -0.01925
2022 11 11 59894 0.1964 0.2595 -0.01894
2022 11 12 59895 0.1946 0.2587 -0.01857
2022 11 13 59896 0.1927 0.2580 -0.01813
2022 11 14 59897 0.1908 0.2572 -0.01775
2022 11 15 59898 0.1889 0.2565 -0.01747
2022 11 16 59899 0.1870 0.2559 -0.01734
2022 11 17 59900 0.1851 0.2552 -0.01740
2022 11 18 59901 0.1832 0.2546 -0.01760
These predictions are based on all announced leap seconds.
CELESTIAL POLE OFFSET SERIES:
NEOS Celestial Pole Offset Series
MJD dpsi error deps error
(msec. of arc)
59514 -114.75 0.68 -8.04 0.05
59515 -114.54 0.68 -8.09 0.05
59516 -114.07 0.68 -8.00 0.05
59517 -113.56 0.70 -7.78 0.12
59518 -113.35 0.70 -7.55 0.12
59519 -113.52 0.72 -7.40 0.10
59520 -113.81 0.74 -7.26 0.06
59521 -113.98 0.74 -7.07 0.06
IAU2000A Celestial Pole Offset Series
MJD dX error dY error
(msec. of arc)
59514 0.270 0.269 -0.049 0.052
59515 0.272 0.269 -0.050 0.052
59516 0.275 0.269 -0.055 0.052
59517 0.279 0.279 -0.059 0.119
59518 0.282 0.279 -0.061 0.119
59519 0.286 0.286 -0.063 0.098
59520 0.290 0.296 -0.063 0.056
59521 0.294 0.296 -0.064 0.056
The recommended software to predict celestial pole offsets can be found at
and software for the calculation of the dX and dY components with
respect to IAU2000A Nutation/Precession Theory can be found at the
web site in Chapter 5 Section 5.5 of the IERS Conventions (2010).
历史数据如下：
曲线如下所示：
Bulletin B
提供地球自转相关参数，每月更新一次(monthly)每日参数。包含如下5种参数：
（1）综合参数。Daily final values at 0:00 UT of x, y, UT1-UTC, dX, dY, and their uncertainties. Time span: one month with final values, one month with preliminary values.
（2）极移相关。Daily final values at 0:00 UT of celestial pole offsets dPsi and dEps in the IAU 1980 system and their uncertainties.
（3）地球自转角速度相关。Earth angular velocity (daily estimates of LOD and OMEGA with their uncertainties).
（4）闰秒相关。Information on the time scales and announcement of occurring leap seconds.
（5）Average formal precision of the individual and combined series contributing or not to the combination and their agreement with the combination.
最新信息如下：
BULLETIN B 405
1 November 2021
Contents are described in https://hpiers.obspm.fr/iers/bul/bulb_new/bulletinb.pdf
1 - DAILY FINAL VALUES OF x, y, UT1-UTC, dX, dY
Angular unit is milliarcsecond (mas), time unit is millisecond (ms).
Upgraded solution from March 1 2017 - consistent with ITRF 2014.
DATE MJD x y UT1-UTC dX dY x err y err UT1 err dX err dY err
(0 h UTC) mas mas ms mas mas mas mas ms mas mas
Final values
Mean formal error 0.023 0.017 0.0091 0.020 0.044
2021 9 2 59459 243.859 325.972 -118.2574 0.260 -0.013 0.023 0.017 0.0106 0.055 0.059
2021 9 3 59460 243.838 324.135 -117.2280 0.266 -0.077 0.023 0.017 0.0105 0.055 0.057
2021 9 4 59461 243.924 322.819 -116.2657 0.233 -0.089 0.023 0.017 0.0106 0.054 0.056
2021 9 5 59462 243.284 321.221 -115.4565 0.188 -0.083 0.023 0.017 0.0107 0.054 0.054
2021 9 6 59463 242.288 319.291 -114.9183 0.143 -0.077 0.024 0.017 0.0113 0.054 0.053
2021 9 7 59464 241.085 317.267 -114.5864 0.097 -0.071 0.024 0.017 0.0109 0.053 0.052
2021 9 8 59465 240.168 315.380 -114.4389 0.052 -0.065 0.024 0.017 0.0107 0.053 0.051
2021 9 9 59466 239.509 313.682 -114.4456 0.108 -0.082 0.024 0.017 0.0093 0.053 0.050
2021 9 10 59467 239.055 311.944 -114.5001 0.190 -0.103 0.024 0.017 0.0091 0.053 0.049
2021 9 11 59468 238.903 310.398 -114.5067 0.217 -0.108 0.024 0.017 0.0091 0.052 0.048
2021 9 12 59469 239.057 309.176 -114.3417 0.225 -0.108 0.023 0.017 0.0090 0.052 0.047
2021 9 13 59470 239.061 308.241 -113.9194 0.233 -0.107 0.023 0.017 0.0091 0.052 0.046
2021 9 14 59471 238.135 306.840 -113.2542 0.240 -0.106 0.023 0.017 0.0089 0.052 0.045
2021 9 15 59472 236.855 305.424 -112.4265 0.259 -0.133 0.023 0.018 0.0089 0.052 0.045
2021 9 16 59473 235.175 304.217 -111.5600 0.281 -0.168 0.023 0.017 0.0090 0.051 0.044
2021 9 17 59474 234.052 302.470 -110.7776 0.303 -0.202 0.023 0.018 0.0091 0.051 0.044
2021 9 18 59475 233.267 300.669 -110.1847 0.293 -0.178 0.023 0.018 0.0091 0.051 0.043
2021 9 19 59476 231.901 298.971 -109.7908 0.272 -0.133 0.023 0.018 0.0092 0.051 0.042
2021 9 20 59477 230.860 297.082 -109.5369 0.250 -0.087 0.024 0.018 0.0090 0.051 0.041
2021 9 21 59478 230.386 295.169 -109.3835 0.228 -0.042 0.024 0.018 0.0091 0.051 0.041
2021 9 22 59479 230.280 293.410 -109.2939 0.212 -0.051 0.024 0.019 0.0092 0.051 0.040
2021 9 23 59480 229.745 291.932 -109.2075 0.198 -0.074 0.024 0.018 0.0085 0.051 0.040
2021 9 24 59481 229.059 290.744 -109.0710 0.184 -0.098 0.024 0.019 0.0086 0.051 0.040
2021 9 25 59482 228.196 289.721 -108.8548 0.195 -0.100 0.024 0.019 0.0087 0.051 0.039
2021 9 26 59483 226.765 288.616 -108.5235 0.213 -0.096 0.025 0.019 0.0088 0.051 0.038
2021 9 27 59484 224.983 286.909 -108.0259 0.230 -0.091 0.025 0.019 0.0076 0.051 0.037
2021 9 28 59485 223.233 285.091 -107.3996 0.248 -0.087 0.025 0.019 0.0075 0.050 0.036
2021 9 29 59486 221.642 283.266 -106.7014 0.260 -0.096 0.025 0.019 0.0073 0.050 0.035
2021 9 30 59487 220.649 281.274 -105.9687 0.271 -0.109 0.025 0.020 0.0072 0.050 0.034
2021 10 1 59488 219.900 279.843 -105.2566 0.282 -0.121 0.025 0.019 0.0072 0.050 0.033
Preliminary extension
2021 10 2 59489 219.232 278.385 -104.6635 0.293 -0.134 0.025 0.020 0.0072 0.050 0.032
2021 10 3 59490 218.114 277.440 -104.2262 0.305 -0.147 0.025 0.020 0.0071 0.050 0.031
2021 10 4 59491 216.468 276.395 -104.0410 0.316 -0.159 0.025 0.020 0.0070 0.050 0.031
2021 10 5 59492 214.967 275.266 -104.1426 0.327 -0.172 0.025 0.020 0.0069 0.050 0.030
2021 10 6 59493 212.890 274.071 -104.5133 0.257 -0.165 0.024 0.020 0.0071 0.051 0.032
2021 10 7 59494 210.668 272.305 -105.0356 0.168 -0.154 0.024 0.020 0.0073 0.053 0.035
2021 10 8 59495 208.744 270.355 -105.5549 0.079 -0.142 0.024 0.020 0.0076 0.054 0.039
2021 10 9 59496 206.989 268.621 -105.9192 0.047 -0.131 0.024 0.020 0.0079 0.500 0.500
2021 10 10 59497 205.589 267.051 -106.0522 0.076 -0.125 0.024 0.020 0.0082 0.500 0.500
2021 10 11 59498 204.293 265.935 -105.9543 0.144 -0.124 0.025 0.020 0.0085 0.500 0.500
2021 10 12 59499 202.934 265.318 -105.6850 0.215 -0.127 0.025 0.020 0.0088 0.500 0.500
2021 10 13 59500 201.345 265.113 -105.3514 0.254 -0.130 0.025 0.020 0.0092 0.500 0.500
2021 10 14 59501 199.532 264.475 -105.0681 0.251 -0.131 0.025 0.020 0.0095 0.500 0.500
2021 10 15 59502 197.145 264.051 -104.8445 0.222 -0.128 0.026 0.021 0.0098 0.500 0.500
2021 10 16 59503 194.539 263.308 -104.7370 0.194 -0.122 0.026 0.021 0.0100 0.500 0.500
2021 10 17 59504 192.521 262.737 -104.7974 0.187 -0.112 0.026 0.021 0.0103 0.500 0.500
2021 10 18 59505 190.328 262.125 -104.9803 0.200 -0.103 0.027 0.021 0.0106 0.500 0.500
2021 10 19 59506 188.429 261.104 -105.2903 0.217 -0.097 0.027 0.021 0.0109 0.500 0.500
2021 10 20 59507 186.954 260.390 -105.6536 0.222 -0.096 0.028 0.022 0.0113 0.500 0.500
2021 10 21 59508 185.888 259.685 -105.9425 0.214 -0.100 0.028 0.022 0.0116 0.500 0.500
2021 10 22 59509 185.111 258.936 -106.1405 0.203 -0.108 0.028 0.022 0.0119 0.500 0.500
2021 10 23 59510 183.996 258.127 -106.1835 0.202 -0.117 0.029 0.023 0.0122 0.500 0.500
2021 10 24 59511 182.170 256.865 -105.9600 0.215 -0.123 0.029 0.023 0.0124 0.500 0.500
2021 10 25 59512 180.756 255.683 -105.5671 0.233 -0.126 0.030 0.023 0.0128 0.500 0.500
2021 10 26 59513 179.436 255.133 -105.0647 0.243 -0.125 0.031 0.024 0.0132 0.500 0.500
2021 10 27 59514 177.472 254.623 -104.5525 0.237 -0.124 0.032 0.024 0.0137 0.500 0.500
2021 10 28 59515 174.986 254.205 -104.1327 0.226 -0.127 0.033 0.025 0.0142 0.500 0.500
2021 10 29 59516 172.885 253.728 -103.7683 0.226 -0.136 0.034 0.026 0.0148 0.500 0.500
2021 10 30 59517 171.141 253.493 -103.5929 0.247 -0.149 0.035 0.027 0.0153 0.500 0.500
2021 10 31 59518 169.136 253.040 -103.7186 0.279 -0.164 0.037 0.028 0.0159 0.500 0.500
2021 11 1 59519 167.147 252.476 -104.2354 0.299 -0.174 0.039 0.029 0.0164 0.500 0.500
2 - DAILY FINAL VALUES OF CELESTIAL POLE OFFSETS dPsi1980 & dEps1980
dPsi1980 dEps1980 ....dPsi,dEps / IAU 1980 precession-nutation model
Description : ftp://hpiers.obspm.fr/iers/bul/bulb_new/bulletinb.pdf
The Reference Systems are described in the 2006 IERS Annual Report.
DATE MJD dPsi1980 dEps1980 sig dPsi sig dEps
(0 h UTC) mas mas mas mas
2021 9 2 59459 -118.581 -9.390 0.138 0.059
2021 9 3 59460 -118.364 -9.679 0.138 0.057
2021 9 4 59461 -118.147 -9.782 0.136 0.056
2021 9 5 59462 -117.995 -9.664 0.136 0.054
2021 9 6 59463 -117.966 -9.415 0.136 0.053
2021 9 7 59464 -118.054 -9.194 0.133 0.052
2021 9 8 59465 -118.217 -9.134 0.133 0.051
2021 9 9 59466 -118.199 -9.278 0.133 0.050
2021 9 10 59467 -118.196 -9.493 0.133 0.049
2021 9 11 59468 -118.376 -9.600 0.131 0.048
2021 9 12 59469 -118.582 -9.536 0.131 0.047
2021 9 13 59470 -118.703 -9.367 0.131 0.046
2021 9 14 59471 -118.709 -9.209 0.131 0.045
2021 9 15 59472 -118.563 -9.153 0.131 0.045
2021 9 16 59473 -118.302 -9.166 0.128 0.044
2021 9 17 59474 -117.983 -9.205 0.128 0.044
2021 9 18 59475 -117.773 -9.189 0.128 0.043
2021 9 19 59476 -117.690 -9.120 0.128 0.042
2021 9 20 59477 -117.703 -8.970 0.128 0.041
2021 9 21 59478 -117.748 -8.731 0.128 0.041
2021 9 22 59479 -117.791 -8.533 0.128 0.040
2021 9 23 59480 -117.893 -8.459 0.128 0.040
2021 9 24 59481 -118.064 -8.550 0.128 0.040
2021 9 25 59482 -118.132 -8.702 0.128 0.039
2021 9 26 59483 -118.029 -8.801 0.128 0.038
2021 9 27 59484 -117.816 -8.811 0.128 0.037
2021 9 28 59485 -117.636 -8.811 0.126 0.036
2021 9 29 59486 -117.530 -8.894 0.126 0.035
2021 9 30 59487 -117.318 -9.028 0.126 0.034
2021 10 1 59488 -116.884 -9.102 0.126 0.033
3 - EARTH ANGULAR VELOCITY : DAILY FINAL VALUES OF LOD, OMEGA AT 0hUTC
LOD : Excess of the Length of day - 86400 s TAI
OMEGA : Earth angular velocity
Description: ftp://hpiers.obspm.fr/iers/bul/bulb_new/bulletinb.pdf
DATE MJD LOD sigma OMEGA sigma
(0 h UTC) ms ms mas/ms mas/ms
2021 9 2 59459 -1.0516 0.0070 15.04106736174 0.00000000122
2021 9 3 59460 -1.0009 0.0069 15.04106735291 0.00000000120
2021 9 4 59461 -0.8934 0.0069 15.04106733420 0.00000000120
2021 9 5 59462 -0.7065 0.0069 15.04106730166 0.00000000120
2021 9 6 59463 -0.4500 0.0069 15.04106725701 0.00000000120
2021 9 7 59464 -0.2230 0.0069 15.04106721749 0.00000000120
2021 9 8 59465 -0.0487 0.0069 15.04106718715 0.00000000120
2021 9 9 59466 0.0445 0.0068 15.04106717092 0.00000000118
2021 9 10 59467 0.0481 0.0069 15.04106717030 0.00000000120
2021 9 11 59468 -0.0661 0.0068 15.04106719018 0.00000000118
2021 9 12 59469 -0.2835 0.0068 15.04106722802 0.00000000118
2021 9 13 59470 -0.5446 0.0068 15.04106727348 0.00000000118
2021 9 14 59471 -0.7658 0.0069 15.04106731199 0.00000000120
2021 9 15 59472 -0.8470 0.0069 15.04106732612 0.00000000120
2021 9 16 59473 -0.8380 0.0068 15.04106732455 0.00000000118
2021 9 17 59474 -0.6952 0.0068 15.04106729970 0.00000000118
2021 9 18 59475 -0.4981 0.0068 15.04106726538 0.00000000118
2021 9 19 59476 -0.3079 0.0068 15.04106723227 0.00000000118
2021 9 20 59477 -0.1935 0.0069 15.04106721236 0.00000000120
2021 9 21 59478 -0.1309 0.0068 15.04106720146 0.00000000118
2021 9 22 59479 -0.0808 0.0068 15.04106719274 0.00000000118
2021 9 23 59480 -0.1148 0.0067 15.04106719866 0.00000000117
2021 9 24 59481 -0.1808 0.0068 15.04106721015 0.00000000118
2021 9 25 59482 -0.2793 0.0068 15.04106722729 0.00000000118
2021 9 26 59483 -0.4236 0.0068 15.04106725241 0.00000000118
2021 9 27 59484 -0.5541 0.0068 15.04106727513 0.00000000118
2021 9 28 59485 -0.6578 0.0068 15.04106729318 0.00000000118
2021 9 29 59486 -0.7266 0.0068 15.04106730516 0.00000000118
2021 9 30 59487 -0.7290 0.0068 15.04106730558 0.00000000118
2021 10 1 59488 -0.6552 0.0067 15.04106729273 0.00000000117
4 - INFORMATION ON TIME SCALES
TAI - UTC = 37 s. during period [59459-59488]
No leap second introduced during period [59459-59488]
All information concerning time scales :
- leap seconds announcements : Bulletin C
- DUT1 announcements (UT1-UTC with 0.1 s accuracy) : Bulletin D
can be found at :
- web site : http://hpiers.obspm.fr/eop-pc/
- anonymous ftp://hpiers.obspm.fr/iers/
5 - SUMMARY OF CONTRIBUTED EARTH ORIENTATION PARAMETERS SERIES
This section gives the average precision of the individual series, some of them
contributing to the combination (*) and their average agreement with it.
The period covered is that one of Bulletin B.
Units : micro-arc-seconds for x/y/dX/dY micro-seconds for UT1/LOD
-----------------------------------------------------------------------------
EOP series first line : Mean formal uncertainty
Periods covered second line : Weighted RMS agreement with Bulletin B
-----------------------------------------------------------------------------
x y UT1 LOD dX dY Data Number
VLBI Standards
CGS
cgs2007a.eops 155 175 13 - 0 0 9
59460.24 to 59485.63 260 369 98 - 74 211
BKG
bkg00020a.eops 57 70 4 - 15 43 9
59460.27 to 59485.21 89 158 13 - 46 64
GSFC
gsf2020a.eoxy 50 55 3 11 14 40 9
59460.27 to 59485.21 113 86 12 24 41 53
IAA
iaa2021a.eops 43 48 2 - 12 33 8
59460.27 to 59485.21 198 344 17 - 50 124
USNO
usn2021b.eoxy 41 52 3 - 15 45 9
59460.27 to 59485.21 133 168 12 - 37 27
IVS *
ivs20r1X.eops 13 16 0 - 5 14 8
59460.25 to 59485.21 80 47 8 - 9 9
VLBI Intensive
GSI *
gsiint2c.eopi - - 4 - - - 7
59461.33 to 59483.33 - - 15 - - -
BKG *
bkg2020.eopi - - 12 - - - 32
59459.79 to 59487.79 - - 38 - - -
GSFC *
gsf2020a.eopi - - 17 - - - 31
59459.79 to 59487.79 - - 178 - - -
IAA *
iaa2021a.eopi - - 72 - - - 31
59459.79 to 59487.79 - - 62 - - -
USNO *
usn2021b.eopi - - 13 - - - 31
59459.79 to 59487.79 - - 87 - - -
GPS
CODE
COD*ERP_R 5 5 - 0 - - 29
59459.50 to 59487.50 26 25 - 14 - -
JPL
jpl*.erp 11 12 - 7 - - 29
59459.50 to 59487.50 40 34 - 16 - -
GFZ
gfz*.erp 7 8 - 2 - - 29
59459.50 to 59487.50 31 34 - 9 - -
ESOC
esa*.erp 7 8 - 4 - - 29
59459.50 to 59487.50 32 36 - 9 - -
SIO
sio*.erp siu*.erp 30 28 - 5 - - 29
59459.50 to 59487.50 43 34 - 14 - -
EMR
emr*.erp 3 3 - 1 - - 29
59459.50 to 59487.50 48 38 - 15 - -
IAA
gnss.res 0 0 - 0 - - 29
59459.50 to 59487.50 53 69 - 24 - -
GRGS
grg*.erp 228 228 - 0 - - 29
59459.50 to 59487.50 24 20 - 12 - -
ASI
asi*.erp 9 9 - 0 - - 29
59459.50 to 59487.50 52 45 - 64 - -
MIT
mit*.erp 12 12 - 2 - - 29
59459.50 to 59487.50 37 36 - 13 - -
IGR *
igs96p02.erp 9 8 - 2 - - 29
59459.50 to 59487.50 28 27 - 10 - -
IGS *
igs00p03.erp 3 3 - 0 - - 29
59459.50 to 59487.50 30 32 - 13 - -
SLR
MCC
tg*.02 165 183 - 34 - - 30
59459.00 to 59488.00 102 107 - 220 - -
IAA
slr_v.dat 55 64 - 4 - - 29
59459.00 to 59488.00 209 202 - 26 - -
ASI
slr_oca*.eop 64 73 - 15 - - 29
59459.50 to 59487.50 193 224 - 48 - -
ILRS *
ilrsa.eop 36 41 - 6 - - 29
59459.50 to 59487.50 150 178 - 32 - -
BULLETIN A
NEOS
mark3.out 20 21 5 - - - 30
59459.00 to 59488.00 55 40 31 - - -
To unsubscribe : http://hpiers.obspm.fr/eop-pc/products/bulletins/bulletin_registration.html
历史数据如下： 
曲线如下所示：
Bulletin C
提供UTC时间中闰秒信息，每半年更新一次(bi-annual)。
最新信息如下：
INTERNATIONAL EARTH ROTATION AND REFERENCE SYSTEMS SERVICE (IERS)
SERVICE INTERNATIONAL DE LA ROTATION TERRESTRE ET DES SYSTEMES DE REFERENCE
SERVICE DE LA ROTATION TERRESTRE DE L'IERS
OBSERVATOIRE DE PARIS
61, Av. de l'Observatoire 75014 PARIS (France)
Tel. : +33 1 40 51 23 35
e-mail : services.iers@obspm.fr
http://hpiers.obspm.fr/eop-pc
Paris, 05 July 2021
Bulletin C 62
To authorities responsible
for the measurement and
distribution of time
INFORMATION ON UTC - TAI
NO leap second will be introduced at the end of December 2021.
The difference between Coordinated Universal Time UTC and the
International Atomic Time TAI is :
from 2017 January 1, 0h UTC, until further notice : UTC-TAI = -37 s
Leap seconds can be introduced in UTC at the end of the months of December
or June, depending on the evolution of UT1-TAI. Bulletin C is mailed every
six months, either to announce a time step in UTC, or to confirm that there
will be no time step at the next possible date.
Christian BIZOUARD
Director
Earth Orientation Center of IERS
Observatoire de Paris, France
历史数据如下：
Bulletin D
提供UT1-UTC的值，由于需要维护0.1s的精度，更新日期不定(irregular)。
最新信息如下：
INTERNATIONAL EARTH ROTATION AND REFERENCE SYSTEMS SERVICE (IERS)
SERVICE INTERNATIONAL DE LA ROTATION TERRESTRE ET DES SYSTEMES DE REFERENCE
SERVICE DE LA ROTATION TERRESTRE
OBSERVATOIRE DE PARIS
61, Av. de l'Observatoire
75014 PARIS (France)
Tel. 33 (0) 1 40 51 23 35
http://iers.obspm.fr
email: services.iers@obspm.fr Paris, 29 June 2021
Bulletin D 141
ANNOUNCEMENT OF DUT1
From the
17 July 2021, 0h UTC
until further notice, the value of DUT1 to be disseminated with the
time signals will be
DUT1 = -0.1 s
Bulletin D 142 should be issued in September 2021
To unsubscribe: http://hpiers.obspm.fr/eop-pc/products/bulletins/bulletin_registration.html
历史数据如下： 
