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：

/IERS/EN/Home/home_node.html/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 .

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 Vol. XXXIV No. 046 ______________________________________________________________________ GENERAL INFORMATION: To receive this information electronically, contact: ser7@maia.usno.navy.mil or use <http://maia.usno.navy.mil/docrequest.html> 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 secondsDUT1= (UT1-UTC) transmitted with time signals= -0.1 seconds beginning 17 July at 0000 UTCBeginning 1 January :TAI-UTC = 37.000 000 seconds ************************************************************************ ** There will NOT be a leap second introduced ** in UTC at the end of Dec ** ** The US Naval Observatory's Rapid Service/Prediction Center website ** (maia.usno.navy.mil) must undergo modernization and has been ** offline since 24 October . The expected completion of work and ** return of service will be no earlier than Summer of . ** ** 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:** /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 , new versions of the USNO VLBI** solutions (usnc.eoxy and usnc.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 <http://www.usno.navy.mil/USNO/earth-orientation/eo-info/general/input-data>. 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 MJDx errory error UT1-UTC error "" "" s s21 11 12 59530 0.14852 .00009 0.24659 .00009 -0.106946 0.00001421 11 13 59531 0.14774 .00009 0.24648 .00009 -0.107249 0.00001621 11 14 59532 0.14695 .00009 0.24644 .00009 -0.107641 0.00001421 11 15 59533 0.14563 .00009 0.24631 .00009 -0.108004 0.00001021 11 16 59534 0.14361 .00009 0.24596 .00009 -0.108268 0.00001021 11 17 59535 0.14152 .00009 0.24546 .00009 -0.108455 0.00000921 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) = 37.0The accuracy may be estimated from the expressions: S x,y = 0.00068 (MJD-59536)**0.80 S t = 0.00025 (MJD-59536)**0.75Estimated accuracies are: Predictions10 d 20 d 30 d 40 dPolar coord's 0.004 0.007 0.010 0.013UT1-UTC 0.0014 0.0024 0.0032 0.0040 MJDx(arcsec) y(arcsec) UT1-UTC(sec) 11 19 59537 0.13800.2449-0.10844 11 20 59538 0.13620.2448-0.10816 11 21 59539 0.13450.2447-0.10772 11 22 59540 0.13270.2448-0.10718 11 23 59541 0.13080.2448-0.10658 11 24 59542 0.12890.2449-0.10597 11 25 59543 0.12700.2449-0.10541 11 26 59544 0.12510.2450-0.10498 11 27 59545 0.12330.2451-0.10473 11 28 59546 0.12150.2452-0.10472 11 29 59547 0.11950.2455-0.10494 11 30 59548 0.11750.2457-0.10533 12 1 59549 0.11550.2460-0.10580 12 2 59550 0.11350.2463-0.10625 12 3 59551 0.11140.2466-0.10657 12 4 59552 0.10940.2470-0.10665 12 5 59553 0.10750.2474-0.10649 12 6 59554 0.10560.2478-0.10614 12 7 59555 0.10360.2483-0.10573 12 8 59556 0.10170.2488-0.10540 12 9 59557 0.09980.2493-0.10522 12 10 59558 0.09790.2499-0.10521 12 11 59559 0.09600.2504-0.10533 12 12 59560 0.09400.2510-0.10551 12 13 59561 0.09220.2516-0.10569 12 14 59562 0.09030.2523-0.10580 12 15 59563 0.08840.2530-0.10580 12 16 59564 0.08660.2537-0.10563 12 17 59565 0.08470.2544-0.10529 12 18 59566 0.08290.2552-0.10477 12 19 59567 0.08110.2560-0.10412 12 20 59568 0.07930.2568-0.10337 12 21 59569 0.07750.2576-0.10260 12 22 59570 0.07580.2585-0.10187 12 23 59571 0.07410.2594-0.10123 12 24 59572 0.07230.2603-0.10076 12 25 59573 0.07060.2613-0.10048 12 26 59574 0.06890.2622-0.10042 12 27 59575 0.06720.2632-0.10054 12 28 59576 0.06560.2643-0.10078 12 29 59577 0.06390.2653-0.10102 12 30 59578 0.06230.2664-0.10116 12 31 59579 0.06070.2675-0.10109 1 1 59580 0.05910.2686-0.10076 1 2 59581 0.05750.2698-0.10024 1 3 59582 0.05600.2710-0.09962 1 4 59583 0.05440.2722-0.09904 1 5 59584 0.05290.2734-0.09860 1 6 59585 0.05140.2746-0.09836 1 7 59586 0.04990.2759-0.09830 1 8 59587 0.04850.2772-0.09836 1 9 59588 0.04710.2785-0.09844 1 10 59589 0.04560.2799-0.09847 1 11 59590 0.04430.2812-0.09839 1 12 59591 0.04290.2826-0.09815 1 13 59592 0.04160.2840-0.09775 1 14 59593 0.04030.2855-0.09718 1 15 59594 0.03900.2869-0.09647 1 16 59595 0.03770.2884-0.09567 1 17 59596 0.03650.2899-0.09483 1 18 59597 0.03530.2914-0.09405 1 19 59598 0.03410.2929-0.09337 1 20 59599 0.03290.2945-0.09288 1 21 59600 0.03180.2960-0.09260 1 22 59601 0.03070.2976-0.09256 1 23 59602 0.02960.2992-0.09271 1 24 59603 0.02860.3008-0.09299 1 25 59604 0.02750.3025-0.09332 1 26 59605 0.02650.3041-0.09359 1 27 59606 0.02560.3058-0.09371 1 28 59607 0.02460.3075-0.09363 1 29 59608 0.02370.3092-0.09336 1 30 59609 0.02290.3109-0.09299 1 31 59610 0.02200.3126-0.09263 2 1 59611 0.02120.3143-0.09241 2 2 59612 0.02040.3161-0.09240 2 3 59613 0.01970.3179-0.09261 2 4 59614 0.01890.3196-0.09299 2 5 59615 0.01830.3214-0.09344 2 6 59616 0.01760.3232-0.09388 2 7 59617 0.01700.3250-0.09421 2 8 59618 0.01640.3268-0.09439 2 9 59619 0.01580.3287-0.09440 2 10 59620 0.01530.3305-0.09422 2 11 59621 0.01480.3324-0.09390 2 12 59622 0.01430.3342-0.09346 2 13 59623 0.01390.3361-0.09299 2 14 59624 0.01350.3380-0.09254 2 15 59625 0.01310.3398-0.09220 2 16 59626 0.01280.3417-0.09203 2 17 59627 0.01250.3436-0.09208 2 18 59628 0.01220.3455-0.09236 2 19 59629 0.01200.3474-0.09285 2 20 59630 0.01180.3493-0.09348 2 21 59631 0.01160.3512-0.09416 2 22 59632 0.01150.3531-0.09478 2 23 59633 0.01140.3550-0.09524 2 24 59634 0.01130.3570-0.09550 2 25 59635 0.01130.3589-0.09556 2 26 59636 0.01130.3608-0.09549 2 27 59637 0.01130.3627-0.09539 2 28 59638 0.01140.3646-0.09538 3 1 59639 0.01150.3665-0.09557 3 2 59640 0.01160.3685-0.09601 3 3 59641 0.01180.3704-0.09666 3 4 59642 0.01200.3723-0.09744 3 5 59643 0.01220.3742-0.09826 3 6 59644 0.01250.3761-0.09902 3 7 59645 0.01280.3780-0.09955 3 8 59646 0.01310.3799-0.09990 3 9 59647 0.01350.3818-0.10006 3 10 59648 0.01390.3837-0.10005 3 11 59649 0.01430.3856-0.09991 3 12 59650 0.01480.3875-0.09970 3 13 59651 0.01530.3893-0.09949 3 14 59652 0.01580.3912-0.09935 3 15 59653 0.01640.3931-0.09936 3 16 59654 0.01700.3949-0.09957 3 17 59655 0.01770.3967-0.10003 3 18 59656 0.01830.3986-0.10071 3 19 59657 0.01900.4004-0.10157 3 20 59658 0.01980.4022-0.10250 3 21 59659 0.02050.4040-0.10338 3 22 59660 0.02130.4058-0.10410 3 23 59661 0.02220.4076-0.10459 3 24 59662 0.02300.4093-0.10485 3 25 59663 0.02390.4111-0.10494 3 26 59664 0.02480.4128-0.10495 3 27 59665 0.02580.4145-0.10500 3 28 59666 0.02680.4163-0.10521 3 29 59667 0.02780.4179-0.10562 3 30 59668 0.02880.4196-0.10625 3 31 59669 0.02990.4213-0.10705 4 1 59670 0.03100.4229-0.10791 4 2 59671 0.03220.4246-0.10874 4 3 59672 0.03330.4262-0.10946 4 4 59673 0.03450.4278-0.11000 4 5 59674 0.03570.4294-0.11034 4 6 59675 0.03700.4309-0.11047 4 7 59676 0.03830.4325-0.11045 4 8 59677 0.03960.4340-0.11032 4 9 59678 0.04090.4355-0.11014 4 10 59679 0.04230.4370-0.11001 4 11 59680 0.04360.4385-0.10998 4 12 59681 0.04500.4399-0.11012 4 13 59682 0.04650.4413-0.11048 4 14 59683 0.04790.4427-0.11107 4 15 59684 0.04940.4441-0.11187 4 16 59685 0.05090.4455-0.11278 4 17 59686 0.05250.4468-0.11370 4 18 59687 0.05400.4481-0.11447 4 19 59688 0.05560.4494-0.11501 4 20 59689 0.05720.4507-0.11527 4 21 59690 0.05880.4519-0.11531 4 22 59691 0.06050.4531-0.11522 4 23 59692 0.06210.4543-0.11513 4 24 59693 0.06380.4555-0.11514 4 25 59694 0.06550.4566-0.11532 4 26 59695 0.06730.4577-0.11570 4 27 59696 0.06900.4588-0.11623 4 28 59697 0.07080.4599-0.11684 4 29 59698 0.07260.4609-0.11744 4 30 59699 0.07440.4619-0.11794 5 1 59700 0.07620.4629-0.11828 5 2 59701 0.07800.4639-0.11842 5 3 59702 0.07990.4648-0.11834 5 4 59703 0.08180.4657-0.11807 5 5 59704 0.08370.4665-0.11766 5 6 59705 0.08560.4674-0.11718 5 7 59706 0.08750.4682-0.11669 5 8 59707 0.08940.4690-0.11627 5 9 59708 0.09140.4697-0.11598 5 10 59709 0.09330.4705-0.11589 5 11 59710 0.09530.4712-0.11600 5 12 59711 0.09730.4718-0.11633 5 13 59712 0.09930.4724-0.11683 5 14 59713 0.10130.4731-0.11738 5 15 59714 0.10330.4736-0.11787 5 16 59715 0.10530.4742-0.11817 5 17 59716 0.10740.4747-0.11821 5 18 59717 0.10940.4752-0.11800 5 19 59718 0.11150.4756-0.11763 5 20 59719 0.11350.4760-0.11723 5 21 59720 0.11560.4764-0.11694 5 22 59721 0.11770.4768-0.11683 5 23 59722 0.11970.4771-0.11694 5 24 59723 0.12180.4774-0.11725 5 25 59724 0.12390.4777-0.11766 5 26 59725 0.12600.4779-0.11810 5 27 59726 0.12810.4781-0.11846 5 28 59727 0.13020.4783-0.11867 5 29 59728 0.13230.4784-0.11867 5 30 59729 0.13440.4785-0.11842 5 31 59730 0.13650.4786-0.11796 6 1 59731 0.13860.4786-0.11732 6 2 59732 0.14070.4786-0.11658 6 3 59733 0.14280.4786-0.11582 6 4 59734 0.14500.4785-0.11512 6 5 59735 0.14710.4784-0.11453 6 6 59736 0.14920.4783-0.11411 6 7 59737 0.15130.4782-0.11388 6 8 59738 0.15340.4780-0.11383 6 9 59739 0.15550.4778-0.11394 6 10 59740 0.15750.4775-0.11414 6 11 59741 0.15960.4772-0.11431 6 12 59742 0.16170.4769-0.11431 6 13 59743 0.16380.4766-0.11405 6 14 59744 0.16580.4762-0.11347 6 15 59745 0.16790.4758-0.11262 6 16 59746 0.17000.4754-0.11161 6 17 59747 0.17200.4749-0.11059 6 18 59748 0.17400.4744-0.10968 6 19 59749 0.17610.4739-0.10894 6 20 59750 0.17810.4733-0.10835 6 21 59751 0.18010.4727-0.10784 6 22 59752 0.18210.4721-0.10735 6 23 59753 0.18400.4715-0.10681 6 24 59754 0.18600.4708-0.10618 6 25 59755 0.18800.4701-0.10539 6 26 59756 0.18990.4693-0.10443 6 27 59757 0.19180.4686-0.10330 6 28 59758 0.19370.4678-0.10200 6 29 59759 0.19560.4669-0.10051 6 30 59760 0.19750.4661-0.09895 7 1 59761 0.19940.4652-0.09747 7 2 59762 0.0.4643-0.09618 7 3 59763 0.20310.4633-0.09503 7 4 59764 0.20490.4624-0.09408 7 5 59765 0.20670.4614-0.09337 7 6 59766 0.20850.4603-0.09278 7 7 59767 0.21020.4593-0.09231 7 8 59768 0.21200.4582-0.09183 7 9 59769 0.21370.4571-0.09125 7 10 59770 0.21540.4560-0.09045 7 11 59771 0.21710.4548-0.08939 7 12 59772 0.21880.4536-0.08806 7 13 59773 0.22040.4524-0.08664 7 14 59774 0.22200.4512-0.08522 7 15 59775 0.22360.4499-0.08392 7 16 59776 0.22520.4487-0.08290 7 17 59777 0.22670.4474-0.08210 7 18 59778 0.22820.4460-0.08151 7 19 59779 0.22970.4447-0.08093 7 20 59780 0.23120.4433-0.08020 7 21 59781 0.23270.4419-0.07930 7 22 59782 0.23410.4405-0.07820 7 23 59783 0.23550.4391-0.07684 7 24 59784 0.23690.4376-0.07526 7 25 59785 0.23820.4361-0.07347 7 26 59786 0.23950.4346-0.07156 7 27 59787 0.24080.4331-0.06962 7 28 59788 0.24210.4316-0.06767 7 29 59789 0.24330.4300-0.06587 7 30 59790 0.24450.4284-0.06424 7 31 59791 0.24570.4268-0.06283 8 1 59792 0.24680.4252-0.06163 8 2 59793 0.24800.4236-0.06063 8 3 59794 0.24900.4220-0.05973 8 4 59795 0.25010.4203-0.05881 8 5 59796 0.25110.4186-0.05782 8 6 59797 0.25210.4169-0.05673 8 7 59798 0.25310.4152-0.05542 8 8 59799 0.25400.4135-0.05393 8 9 59800 0.25490.4118-0.05237 8 10 59801 0.25580.4100-0.05082 8 11 59802 0.25670.4083-0.04941 8 12 59803 0.25750.4065-0.04822 8 13 59804 0.25820.4047-0.04729 8 14 59805 0.25900.4029-0.04661 8 15 59806 0.25970.4011-0.04607 8 16 59807 0.26040.3993-0.04555 8 17 59808 0.26100.3974-0.04495 8 18 59809 0.26160.3956-0.04417 8 19 59810 0.26220.3938-0.04317 8 20 59811 0.26280.3919-0.04201 8 21 59812 0.26330.3900-0.04069 8 22 59813 0.26380.3882-0.03915 8 23 59814 0.26420.3863-0.03755 8 24 59815 0.26460.3844-0.03596 8 25 59816 0.26500.3825-0.03444 8 26 59817 0.26530.3806-0.03308 8 27 59818 0.26560.3787-0.03193 8 28 59819 0.26590.3768-0.03097 8 29 59820 0.26610.3749-0.03019 8 30 59821 0.26640.3730-0.02962 8 31 59822 0.26650.3711-0.02916 9 1 59823 0.26670.3692-0.02875 9 2 59824 0.26680.3673-0.02832 9 3 59825 0.26680.3653-0.02777 9 4 59826 0.26690.3634-0.02711 9 5 59827 0.26690.3615-0.02638 9 6 59828 0.26680.3596-0.02563 9 7 59829 0.26670.3577-0.02502 9 8 59830 0.26660.3558-0.02461 9 9 59831 0.26650.3538-0.02446 9 10 59832 0.26630.3519-0.02457 9 11 59833 0.26610.3500-0.02489 9 12 59834 0.26590.3481-0.02530 9 13 59835 0.26560.3462-0.02561 9 14 59836 0.26530.3443-0.02573 9 15 59837 0.26490.3424-0.02563 9 16 59838 0.26450.3406-0.02530 9 17 59839 0.26410.3387-0.02478 9 18 59840 0.26370.3368-0.02413 9 19 59841 0.26320.3350-0.02340 9 20 59842 0.26270.3331-0.02263 9 21 59843 0.26210.3313-0.02187 9 22 59844 0.26160.3294-0.02118 9 23 59845 0.26090.3276-0.02070 9 24 59846 0.26030.3258-0.02046 9 25 59847 0.25960.3240-0.02034 9 26 59848 0.25890.3222-0.02033 9 27 59849 0.25820.3204-0.02045 9 28 59850 0.25740.3186-0.02058 9 29 59851 0.25660.3169-0.02060 9 30 59852 0.25570.3151-0.02046 10 1 59853 0.25490.3134-0.02002 10 2 59854 0.25400.3117-0.01939 10 3 59855 0.25300.3100-0.01867 10 4 59856 0.25210.3083-0.01796 10 5 59857 0.25110.3066-0.01743 10 6 59858 0.25000.3050-0.01714 10 7 59859 0.24900.3034-0.01711 10 8 59860 0.24790.3017-0.01744 10 9 59861 0.24680.3001-0.01791 10 10 59862 0.24570.2985-0.01840 10 11 59863 0.24450.2970-0.01876 10 12 59864 0.24330.2954-0.01887 10 13 59865 0.24210.2939-0.01871 10 14 59866 0.24080.2924-0.01836 10 15 59867 0.23950.2909-0.01787 10 16 59868 0.23820.2894-0.01725 10 17 59869 0.23690.2880-0.01658 10 18 59870 0.23560.2865-0.01595 10 19 59871 0.23420.2851-0.01545 10 20 59872 0.23280.2837-0.01514 10 21 59873 0.23130.2824-0.01506 10 22 59874 0.22990.2810-0.01520 10 23 59875 0.22840.2797-0.01558 10 24 59876 0.22690.2784-0.01613 10 25 59877 0.22540.2772-0.01671 10 26 59878 0.22380.2759-0.01717 10 27 59879 0.22230.2747-0.01745 10 28 59880 0.22070.2735-0.01752 10 29 59881 0.21910.2723-0.01739 10 30 59882 0.21740.2712-0.01713 10 31 59883 0.21580.2701-0.01692 11 1 59884 0.21410.2690-0.01678 11 2 59885 0.21240.2679-0.01679 11 3 59886 0.21070.2669-0.01700 11 4 59887 0.20900.2658-0.01740 11 5 59888 0.20720.2649-0.01795 11 6 59889 0.20550.2639-0.01846 11 7 59890 0.20370.2630-0.01893 11 8 59891 0.0.2621-0.01926 11 9 59892 0.20010.2612-0.01938 11 10 59893 0.19830.2603-0.01925 11 11 59894 0.19640.2595-0.01894 11 12 59895 0.19460.2587-0.01857 11 13 59896 0.19270.2580-0.01813 11 14 59897 0.19080.2572-0.01775 11 15 59898 0.18890.2565-0.01747 11 16 59899 0.18700.2559-0.01734 11 17 59900 0.18510.2552-0.01740 11 18 59901 0.18320.2546-0.01760 These predictions are based on all announced leap seconds.CELESTIAL POLE OFFSET SERIES: NEOS Celestial Pole Offset Series MJDdpsi errordeps 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 MJDdXerrordYerror(msec. of arc)59514 0.270 0.269 -0.049 0.05259515 0.272 0.269 -0.050 0.05259516 0.275 0.269 -0.055 0.05259517 0.279 0.279 -0.059 0.11959518 0.282 0.279 -0.061 0.11959519 0.286 0.286 -0.063 0.09859520 0.290 0.296 -0.063 0.05659521 0.294 0.296 -0.064 0.056The recommended software to predict celestial pole offsets can be found at <http://www.usno.navy.mil/USNO/earth-orientation/software/aux/ceppred.f> and software for the calculation of the dX and dY components withrespect to IAU2000A Nutation/Precession Theory can be found at the <http://maia.usno.navy.mil/conv/conventions.html> web site in Chapter 5 Section 5.5 of the IERS Conventions ().

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 4051 November Contents are described in https://hpiers.obspm.fr/iers/bul/bulb_new/bulletinb.pdf 1 - DAILY FINAL VALUES OF x, y, UT1-UTC, dX, dYAngular unit is milliarcsecond (mas), time unit is millisecond (ms). Upgraded solution from March 1 - consistent with ITRF .DATEMJD x yUT1-UTCdXdYx err y err UT1 err dX err dY err(0 h UTC) masmas ms mas masmasmasmsmasmasFinal values Mean formal error0.023 0.017 0.0091 0.020 0.044 9 2 59459 243.859 325.972 -118.2574 0.260 -0.013 0.023 0.017 0.0106 0.055 0.059 9 3 59460 243.838 324.135 -117.2280 0.266 -0.077 0.023 0.017 0.0105 0.055 0.057 9 4 59461 243.924 322.819 -116.2657 0.233 -0.089 0.023 0.017 0.0106 0.054 0.056 9 5 59462 243.284 321.221 -115.4565 0.188 -0.083 0.023 0.017 0.0107 0.054 0.054 9 6 59463 242.288 319.291 -114.9183 0.143 -0.077 0.024 0.017 0.0113 0.054 0.053 9 7 59464 241.085 317.267 -114.5864 0.097 -0.071 0.024 0.017 0.0109 0.053 0.052 9 8 59465 240.168 315.380 -114.4389 0.052 -0.065 0.024 0.017 0.0107 0.053 0.051 9 9 59466 239.509 313.682 -114.4456 0.108 -0.082 0.024 0.017 0.0093 0.053 0.050 9 10 59467 239.055 311.944 -114.5001 0.190 -0.103 0.024 0.017 0.0091 0.053 0.049 9 11 59468 238.903 310.398 -114.5067 0.217 -0.108 0.024 0.017 0.0091 0.052 0.048 9 12 59469 239.057 309.176 -114.3417 0.225 -0.108 0.023 0.017 0.0090 0.052 0.047 9 13 59470 239.061 308.241 -113.9194 0.233 -0.107 0.023 0.017 0.0091 0.052 0.046 9 14 59471 238.135 306.840 -113.2542 0.240 -0.106 0.023 0.017 0.0089 0.052 0.045 9 15 59472 236.855 305.424 -112.4265 0.259 -0.133 0.023 0.018 0.0089 0.052 0.045 9 16 59473 235.175 304.217 -111.5600 0.281 -0.168 0.023 0.017 0.0090 0.051 0.044 9 17 59474 234.052 302.470 -110.7776 0.303 -0.202 0.023 0.018 0.0091 0.051 0.044 9 18 59475 233.267 300.669 -110.1847 0.293 -0.178 0.023 0.018 0.0091 0.051 0.043 9 19 59476 231.901 298.971 -109.7908 0.272 -0.133 0.023 0.018 0.0092 0.051 0.042 9 20 59477 230.860 297.082 -109.5369 0.250 -0.087 0.024 0.018 0.0090 0.051 0.041 9 21 59478 230.386 295.169 -109.3835 0.228 -0.042 0.024 0.018 0.0091 0.051 0.041 9 22 59479 230.280 293.410 -109.2939 0.212 -0.051 0.024 0.019 0.0092 0.051 0.040 9 23 59480 229.745 291.932 -109.2075 0.198 -0.074 0.024 0.018 0.0085 0.051 0.040 9 24 59481 229.059 290.744 -109.0710 0.184 -0.098 0.024 0.019 0.0086 0.051 0.040 9 25 59482 228.196 289.721 -108.8548 0.195 -0.100 0.024 0.019 0.0087 0.051 0.039 9 26 59483 226.765 288.616 -108.5235 0.213 -0.096 0.025 0.019 0.0088 0.051 0.038 9 27 59484 224.983 286.909 -108.0259 0.230 -0.091 0.025 0.019 0.0076 0.051 0.037 9 28 59485 223.233 285.091 -107.3996 0.248 -0.087 0.025 0.019 0.0075 0.050 0.036 9 29 59486 221.642 283.266 -106.7014 0.260 -0.096 0.025 0.019 0.0073 0.050 0.035 9 30 59487 220.649 281.274 -105.9687 0.271 -0.109 0.025 0.020 0.0072 0.050 0.034 10 1 59488 219.900 279.843 -105.2566 0.282 -0.121 0.025 0.019 0.0072 0.050 0.033Preliminary extension 10 2 59489 219.232 278.385 -104.6635 0.293 -0.134 0.025 0.020 0.0072 0.050 0.032 10 3 59490 218.114 277.440 -104.2262 0.305 -0.147 0.025 0.020 0.0071 0.050 0.031 10 4 59491 216.468 276.395 -104.0410 0.316 -0.159 0.025 0.020 0.0070 0.050 0.031 10 5 59492 214.967 275.266 -104.1426 0.327 -0.172 0.025 0.020 0.0069 0.050 0.030 10 6 59493 212.890 274.071 -104.5133 0.257 -0.165 0.024 0.020 0.0071 0.051 0.032 10 7 59494 210.668 272.305 -105.0356 0.168 -0.154 0.024 0.020 0.0073 0.053 0.035 10 8 59495 208.744 270.355 -105.5549 0.079 -0.142 0.024 0.020 0.0076 0.054 0.039 10 9 59496 206.989 268.621 -105.9192 0.047 -0.131 0.024 0.020 0.0079 0.500 0.500 10 10 59497 205.589 267.051 -106.0522 0.076 -0.125 0.024 0.020 0.0082 0.500 0.500 10 11 59498 204.293 265.935 -105.9543 0.144 -0.124 0.025 0.020 0.0085 0.500 0.500 10 12 59499 202.934 265.318 -105.6850 0.215 -0.127 0.025 0.020 0.0088 0.500 0.500 10 13 59500 201.345 265.113 -105.3514 0.254 -0.130 0.025 0.020 0.0092 0.500 0.500 10 14 59501 199.532 264.475 -105.0681 0.251 -0.131 0.025 0.020 0.0095 0.500 0.500 10 15 59502 197.145 264.051 -104.8445 0.222 -0.128 0.026 0.021 0.0098 0.500 0.500 10 16 59503 194.539 263.308 -104.7370 0.194 -0.122 0.026 0.021 0.0100 0.500 0.500 10 17 59504 192.521 262.737 -104.7974 0.187 -0.112 0.026 0.021 0.0103 0.500 0.500 10 18 59505 190.328 262.125 -104.9803 0.200 -0.103 0.027 0.021 0.0106 0.500 0.500 10 19 59506 188.429 261.104 -105.2903 0.217 -0.097 0.027 0.021 0.0109 0.500 0.500 10 20 59507 186.954 260.390 -105.6536 0.222 -0.096 0.028 0.022 0.0113 0.500 0.500 10 21 59508 185.888 259.685 -105.9425 0.214 -0.100 0.028 0.022 0.0116 0.500 0.500 10 22 59509 185.111 258.936 -106.1405 0.203 -0.108 0.028 0.022 0.0119 0.500 0.500 10 23 59510 183.996 258.127 -106.1835 0.202 -0.117 0.029 0.023 0.0122 0.500 0.500 10 24 59511 182.170 256.865 -105.9600 0.215 -0.123 0.029 0.023 0.0124 0.500 0.500 10 25 59512 180.756 255.683 -105.5671 0.233 -0.126 0.030 0.023 0.0128 0.500 0.500 10 26 59513 179.436 255.133 -105.0647 0.243 -0.125 0.031 0.024 0.0132 0.500 0.500 10 27 59514 177.472 254.623 -104.5525 0.237 -0.124 0.032 0.024 0.0137 0.500 0.500 10 28 59515 174.986 254.205 -104.1327 0.226 -0.127 0.033 0.025 0.0142 0.500 0.500 10 29 59516 172.885 253.728 -103.7683 0.226 -0.136 0.034 0.026 0.0148 0.500 0.500 10 30 59517 171.141 253.493 -103.5929 0.247 -0.149 0.035 0.027 0.0153 0.500 0.500 10 31 59518 169.136 253.040 -103.7186 0.279 -0.164 0.037 0.028 0.0159 0.500 0.500 11 1 59519 167.147 252.476 -104.2354 0.299 -0.174 0.039 0.029 0.0164 0.500 0.5002 - DAILY FINAL VALUES OF CELESTIAL POLE OFFSETS dPsi1980 & dEps1980dPsi1980 dEps1980 ....dPsi,dEps / IAU 1980 precession-nutation modelDescription : ftp://hpiers.obspm.fr/iers/bul/bulb_new/bulletinb.pdfThe Reference Systems are described in the IERS Annual Report.DATEMJD dPsi1980 dEps1980 sig dPsi sig dEps (0 h UTC) mas masmas mas 9 2 59459 -118.581 -9.3900.1380.059 9 3 59460 -118.364 -9.6790.1380.057 9 4 59461 -118.147 -9.7820.1360.056 9 5 59462 -117.995 -9.6640.1360.054 9 6 59463 -117.966 -9.4150.1360.053 9 7 59464 -118.054 -9.1940.1330.052 9 8 59465 -118.217 -9.1340.1330.051 9 9 59466 -118.199 -9.2780.1330.050 9 10 59467 -118.196 -9.4930.1330.049 9 11 59468 -118.376 -9.6000.1310.048 9 12 59469 -118.582 -9.5360.1310.047 9 13 59470 -118.703 -9.3670.1310.046 9 14 59471 -118.709 -9.2090.1310.045 9 15 59472 -118.563 -9.1530.1310.045 9 16 59473 -118.302 -9.1660.1280.044 9 17 59474 -117.983 -9.2050.1280.044 9 18 59475 -117.773 -9.1890.1280.043 9 19 59476 -117.690 -9.1200.1280.042 9 20 59477 -117.703 -8.9700.1280.041 9 21 59478 -117.748 -8.7310.1280.041 9 22 59479 -117.791 -8.5330.1280.040 9 23 59480 -117.893 -8.4590.1280.040 9 24 59481 -118.064 -8.5500.1280.040 9 25 59482 -118.132 -8.7020.1280.039 9 26 59483 -118.029 -8.8010.1280.038 9 27 59484 -117.816 -8.8110.1280.037 9 28 59485 -117.636 -8.8110.1260.036 9 29 59486 -117.530 -8.8940.1260.035 9 30 59487 -117.318 -9.0280.1260.034 10 1 59488 -116.884 -9.1020.1260.0333 - EARTH ANGULAR VELOCITY : DAILY FINAL VALUES OF LOD, OMEGA AT 0hUTCLOD: Excess of the Length of day - 86400 s TAI OMEGA : Earth angular velocity Description: ftp://hpiers.obspm.fr/iers/bul/bulb_new/bulletinb.pdfDATE MJDLODsigmaOMEGA sigma (0 h UTC) ms ms mas/msmas/ms 9 2 59459 -1.0516 0.0070 15.04106736174 0.00000000122 9 3 59460 -1.0009 0.0069 15.04106735291 0.00000000120 9 4 59461 -0.8934 0.0069 15.04106733420 0.00000000120 9 5 59462 -0.7065 0.0069 15.04106730166 0.00000000120 9 6 59463 -0.4500 0.0069 15.04106725701 0.00000000120 9 7 59464 -0.2230 0.0069 15.04106721749 0.00000000120 9 8 59465 -0.0487 0.0069 15.04106718715 0.00000000120 9 9 59466 0.0445 0.0068 15.04106717092 0.00000000118 9 10 59467 0.0481 0.0069 15.04106717030 0.00000000120 9 11 59468 -0.0661 0.0068 15.04106719018 0.00000000118 9 12 59469 -0.2835 0.0068 15.04106722802 0.00000000118 9 13 59470 -0.5446 0.0068 15.04106727348 0.00000000118 9 14 59471 -0.7658 0.0069 15.04106731199 0.00000000120 9 15 59472 -0.8470 0.0069 15.04106732612 0.00000000120 9 16 59473 -0.8380 0.0068 15.04106732455 0.00000000118 9 17 59474 -0.6952 0.0068 15.04106729970 0.00000000118 9 18 59475 -0.4981 0.0068 15.04106726538 0.00000000118 9 19 59476 -0.3079 0.0068 15.04106723227 0.00000000118 9 20 59477 -0.1935 0.0069 15.04106721236 0.00000000120 9 21 59478 -0.1309 0.0068 15.0410676 0.00000000118 9 22 59479 -0.0808 0.0068 15.04106719274 0.00000000118 9 23 59480 -0.1148 0.0067 15.04106719866 0.00000000117 9 24 59481 -0.1808 0.0068 15.04106721015 0.00000000118 9 25 59482 -0.2793 0.0068 15.04106722729 0.00000000118 9 26 59483 -0.4236 0.0068 15.04106725241 0.00000000118 9 27 59484 -0.5541 0.0068 15.04106727513 0.00000000118 9 28 59485 -0.6578 0.0068 15.04106729318 0.00000000118 9 29 59486 -0.7266 0.0068 15.04106730516 0.00000000118 9 30 59487 -0.7290 0.0068 15.04106730558 0.00000000118 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 Dcan be found at : - web site : http://hpiers.obspm.fr/eop-pc/- anonymous ftp://hpiers.obspm.fr/iers/ 5 - SUMMARY OF CONTRIBUTED EARTH ORIENTATION PARAMETERS SERIESThis section gives the average precision of the individual series, some of themcontributing 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 uncertaintyPeriods covered second line : Weighted RMS agreement with Bulletin B-----------------------------------------------------------------------------xy UT1 LOD dX dY Data NumberVLBI StandardsCGS cgsa.eops155 175 13-00 959460.24 to 59485.63 260 369 98- 74 211BKG bkg00020a.eops57 704- 15 43 959460.27 to 59485.2189 158 13- 46 64GSFCgsfa.eoxy 50 553 11 14 40 959460.27 to 59485.21 113 86 12 24 41 53IAA iaaa.eops 43 482- 12 33 859460.27 to 59485.21 198 344 17- 50 124USNOusnb.eoxy 41 523- 15 45 959460.27 to 59485.21 133 168 12- 37 27IVS*ivs20r1X.eops 13 160-5 14 859460.25 to 59485.2180 478-99VLBI IntensiveGSI*gsiint2c.eopi --4--- 759461.33 to 59483.33 -- 15---BKG*bkg.eopi -- 12---3259459.79 to 59487.79 -- 38---GSFC*gsfa.eopi -- 17---3159459.79 to 59487.79 -- 178---IAA*iaaa.eopi -- 72---3159459.79 to 59487.79 -- 62---USNO*usnb.eopi -- 13---3159459.79 to 59487.79 -- 87---GPSCODECOD*ERP_R 55-0--2959459.50 to 59487.5026 25- 14--JPL jpl*.erp 11 12-7--2959459.50 to 59487.5040 34- 16--GFZ gfz*.erp 78-2--2959459.50 to 59487.5031 34-9--ESOCesa*.erp 78-4--2959459.50 to 59487.5032 36-9--SIO sio*.erp siu*.erp 30 28-5--2959459.50 to 59487.5043 34- 14--EMR emr*.erp 33-1--2959459.50 to 59487.5048 38- 15--IAA gnss.res 00-0--2959459.50 to 59487.5053 69- 24--GRGSgrg*.erp 228 228-0--2959459.50 to 59487.5024 20- 12--ASI asi*.erp 99-0--2959459.50 to 59487.5052 45- 64--MIT mit*.erp 12 12-2--2959459.50 to 59487.5037 36- 13--IGR*igs96p02.erp 98-2--2959459.50 to 59487.5028 27- 10--IGS*igs00p03.erp 33-0--2959459.50 to 59487.5030 32- 13--SLRMCC tg*.02 165 183- 34--3059459.00 to 59488.00 102 107- 220--IAA slr_v.dat 55 64-4--2959459.00 to 59488.00 209 202- 26--ASI slr_oca*.eop 64 73- 15--2959459.50 to 59487.50 193 224- 48--ILRS*ilrsa.eop 36 41-6--2959459.50 to 59487.50 150 178- 32--BULLETIN ANEOSmark3.out 20 215---3059459.00 to 59488.0055 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 REFERENCESERVICE DE LA ROTATION TERRESTRE DE L'IERSOBSERVATOIRE DE PARIS61, Av. de l'Observatoire 75014 PARIS (France)Tel.: +33 1 40 51 23 35e-mail : services.iers@obspm.frhttp://hpiers.obspm.fr/eop-pcParis, 05 July Bulletin C 62To authorities responsiblefor the measurement anddistribution of timeINFORMATION ON UTC - TAINO leap second will be introduced at the end of December .The difference between Coordinated Universal Time UTC and theInternational Atomic Time TAI is :from January 1, 0h UTC, until further notice : UTC-TAI = -37 sLeap seconds can be introduced in UTC at the end of the months of Decemberor June, depending on the evolution of UT1-TAI. Bulletin C is mailed everysix months, either to announce a time step in UTC, or to confirm that therewill be no time step at the next possible date.Christian BIZOUARDDirectorEarth Orientation Center of IERSObservatoire 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 REFERENCESERVICE DE LA ROTATION TERRESTREOBSERVATOIRE DE PARIS61, Av. de l'Observatoire 75014 PARIS (France)Tel. 33 (0) 1 40 51 23 35 http://iers.obspm.fremail: services.iers@obspm.fr Paris, 29 June Bulletin D 141ANNOUNCEMENT OF DUT1From the17 July , 0h UTCuntil further notice, the value of DUT1 to be disseminated with the time signals will beDUT1 = -0.1 sBulletin D 142 should be issued in September To unsubscribe: http://hpiers.obspm.fr/eop-pc/products/bulletins/bulletin_registration.html

历史数据如下：