********************************************************************** * * * I E R S B U L L E T I N - A * * * * Rapid Service/Prediction of Earth Orientation * ********************************************************************** 30 April 2020 Vol. XXXIII No. 018 ______________________________________________________________________ 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 = -0.2 seconds beginning 02 May 2019 at 0000 UTC Beginning 1 January 2017: TAI-UTC = 37.000 000 seconds *********************************************************************** * * * Notice of Publication Web and FTP Shutdown: * * The US Naval Observatory's Rapid Service/Prediction Center web and * * FTP sites (at maia.usno.navy.mil and toshi.nofs.navy.mil) must * * undergo modernization and have been offline since 24 October 2019. * * The expected completion of work and return of service is no earlier * * than Autumn of 2020 . Please visit https://www.usno.navy.mil and * * submit a Requirements Form to the USNO Public Affairs Official * * (PAO) if the information you are seeking is not accessible via * * another means. If the Requirements Form is not available, please * * contact the USNO PAO Geoff Chester at email address directly * * geoff.chester@navy.mil or phone number 202 762 1438. * * * * Although the Bulletin A makes several references to maia, one * * should note that the paragraph above supercedes any information * * that is contained in the Bulletin A text. Because some users mis- * * takenly use Bulletin A (ser7.dat) instead of other formats (such as * * finals2000A.daily) for operational, machine-to-machine uses, we * * do not wish to change the spacing or text of the files. In the * * past, when spacings had changed, users had stated that any change * * to the Bulletin format outside of this remarks area had broken * * their operations. Therefore, we have not removed the old references * * to maia within the text of the Bulletin A (ser7.dat file). * * * * This shutdown has lead to the indefinite cessation of IERS * * Bulletin A distribution emails. If this occurs, current * * subscribers to the Bulletin A email distribution list may receive * * future mailings from a different address (if this service is * * restored). In the meantime, we will be unable to process email * * subscription/unsubscription requests. * * * * Currently, updated EOPs may be available at NASA's Archive of * * Space Geodesy Data anonymous FTP server at: * * ftp://cddis.gsfc.nasa.gov/pub/products/iers * * Daily EOP data may be uploaded here by 18:00 UTC, and * * Bulletin A EOP data may be available by 20:00 UTC. * * Users should please verify results obtained from this site; * * we cannot guarantee the integrity or timeliness of files provided * * at this mirror site. * * * * For other download options from CDDIS, such as HTTPS, please refer * * to the https://cddis.nasa.gov/About/CDDIS_File_Download_FAQ.html * * * * In addition, updated EOPs may 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. * * * * Questions and enquiries about EOPs can be emailed to the * * following address: * * usn.ncr.navobsydc.mbx.eopcp@mail.mil * * * * 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 20 4 24 58963 0.06554 .00009 0.42826 .00009 -0.241353 0.000015 20 4 25 58964 0.06701 .00009 0.42938 .00009 -0.241676 0.000013 20 4 26 58965 0.06833 .00009 0.43071 .00009 -0.241868 0.000017 20 4 27 58966 0.06943 .00009 0.43191 .00009 -0.241973 0.000019 20 4 28 58967 0.07069 .00009 0.43288 .00009 -0.242049 0.000022 20 4 29 58968 0.07230 .00009 0.43373 .00009 -0.242168 0.000024 20 4 30 58969 0.07409 .00009 0.43462 .00009 -0.242312 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 = 0.1219 - 0.0664 cos A + 0.0824 sin A + 0.0211 cos C + 0.0043 sin C y = 0.3533 + 0.0761 cos A + 0.0610 sin A + 0.0043 cos C - 0.0211 sin C UT1-UTC = -0.2069 - 0.00015 (MJD - 58977) - (UT2-UT1) where A = 2*pi*(MJD-58969)/365.25 and C = 2*pi*(MJD-58969)/435. TAI-UTC(MJD 58970) = 37.0 The accuracy may be estimated from the expressions: S x,y = 0.00068 (MJD-58969)**0.80 S t = 0.00025 (MJD-58969)**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) 2020 5 1 58970 0.0759 0.4355 -0.24237 2020 5 2 58971 0.0777 0.4364 -0.24256 2020 5 3 58972 0.0794 0.4373 -0.24302 2020 5 4 58973 0.0810 0.4382 -0.24372 2020 5 5 58974 0.0826 0.4391 -0.24459 2020 5 6 58975 0.0842 0.4399 -0.24549 2020 5 7 58976 0.0858 0.4405 -0.24629 2020 5 8 58977 0.0875 0.4412 -0.24688 2020 5 9 58978 0.0892 0.4418 -0.24718 2020 5 10 58979 0.0909 0.4424 -0.24721 2020 5 11 58980 0.0927 0.4430 -0.24704 2020 5 12 58981 0.0944 0.4436 -0.24677 2020 5 13 58982 0.0961 0.4442 -0.24656 2020 5 14 58983 0.0979 0.4448 -0.24641 2020 5 15 58984 0.0996 0.4453 -0.24634 2020 5 16 58985 0.1013 0.4457 -0.24634 2020 5 17 58986 0.1031 0.4462 -0.24640 2020 5 18 58987 0.1049 0.4466 -0.24652 2020 5 19 58988 0.1067 0.4470 -0.24666 2020 5 20 58989 0.1085 0.4473 -0.24677 2020 5 21 58990 0.1104 0.4477 -0.24684 2020 5 22 58991 0.1122 0.4480 -0.24683 2020 5 23 58992 0.1140 0.4483 -0.24671 2020 5 24 58993 0.1158 0.4485 -0.24648 2020 5 25 58994 0.1177 0.4487 -0.24613 2020 5 26 58995 0.1195 0.4489 -0.24572 2020 5 27 58996 0.1214 0.4490 -0.24531 2020 5 28 58997 0.1232 0.4492 -0.24495 2020 5 29 58998 0.1251 0.4493 -0.24474 2020 5 30 58999 0.1269 0.4493 -0.24471 2020 5 31 59000 0.1288 0.4494 -0.24487 2020 6 1 59001 0.1307 0.4494 -0.24519 2020 6 2 59002 0.1325 0.4493 -0.24558 2020 6 3 59003 0.1344 0.4493 -0.24592 2020 6 4 59004 0.1363 0.4492 -0.24610 2020 6 5 59005 0.1381 0.4491 -0.24605 2020 6 6 59006 0.1400 0.4489 -0.24575 2020 6 7 59007 0.1418 0.4487 -0.24526 2020 6 8 59008 0.1437 0.4485 -0.24466 2020 6 9 59009 0.1456 0.4483 -0.24403 2020 6 10 59010 0.1474 0.4480 -0.24346 2020 6 11 59011 0.1493 0.4477 -0.24297 2020 6 12 59012 0.1511 0.4474 -0.24258 2020 6 13 59013 0.1529 0.4470 -0.24228 2020 6 14 59014 0.1548 0.4467 -0.24206 2020 6 15 59015 0.1566 0.4462 -0.24187 2020 6 16 59016 0.1584 0.4458 -0.24167 2020 6 17 59017 0.1602 0.4453 -0.24140 2020 6 18 59018 0.1620 0.4448 -0.24103 2020 6 19 59019 0.1638 0.4443 -0.24052 2020 6 20 59020 0.1656 0.4437 -0.23986 2020 6 21 59021 0.1674 0.4431 -0.23908 2020 6 22 59022 0.1691 0.4425 -0.23821 2020 6 23 59023 0.1709 0.4419 -0.23733 2020 6 24 59024 0.1726 0.4412 -0.23652 2020 6 25 59025 0.1744 0.4405 -0.23587 2020 6 26 59026 0.1761 0.4397 -0.23542 2020 6 27 59027 0.1778 0.4390 -0.23518 2020 6 28 59028 0.1795 0.4382 -0.23513 2020 6 29 59029 0.1811 0.4374 -0.23517 2020 6 30 59030 0.1828 0.4365 -0.23520 2020 7 1 59031 0.1844 0.4357 -0.23513 2020 7 2 59032 0.1861 0.4348 -0.23487 2020 7 3 59033 0.1877 0.4339 -0.23438 2020 7 4 59034 0.1893 0.4329 -0.23370 2020 7 5 59035 0.1909 0.4319 -0.23287 2020 7 6 59036 0.1924 0.4309 -0.23199 2020 7 7 59037 0.1940 0.4299 -0.23113 2020 7 8 59038 0.1955 0.4289 -0.23034 2020 7 9 59039 0.1970 0.4278 -0.22966 2020 7 10 59040 0.1985 0.4267 -0.22908 2020 7 11 59041 0.1999 0.4256 -0.22860 2020 7 12 59042 0.2014 0.4244 -0.22816 2020 7 13 59043 0.2028 0.4233 -0.22774 2020 7 14 59044 0.2042 0.4221 -0.22729 2020 7 15 59045 0.2056 0.4209 -0.22676 2020 7 16 59046 0.2069 0.4196 -0.22612 2020 7 17 59047 0.2082 0.4184 -0.22535 2020 7 18 59048 0.2096 0.4171 -0.22447 2020 7 19 59049 0.2108 0.4158 -0.22349 2020 7 20 59050 0.2121 0.4145 -0.22248 2020 7 21 59051 0.2133 0.4131 -0.22153 2020 7 22 59052 0.2145 0.4118 -0.22073 2020 7 23 59053 0.2157 0.4104 -0.22014 2020 7 24 59054 0.2169 0.4090 -0.21978 2020 7 25 59055 0.2180 0.4076 -0.21961 2020 7 26 59056 0.2191 0.4061 -0.21955 2020 7 27 59057 0.2202 0.4047 -0.21947 2020 7 28 59058 0.2212 0.4032 -0.21929 2020 7 29 59059 0.2223 0.4017 -0.21892 2020 7 30 59060 0.2233 0.4002 -0.21833 2020 7 31 59061 0.2242 0.3987 -0.21754 2020 8 1 59062 0.2252 0.3972 -0.21662 2020 8 2 59063 0.2261 0.3956 -0.21563 2020 8 3 59064 0.2269 0.3940 -0.21467 2020 8 4 59065 0.2278 0.3925 -0.21380 2020 8 5 59066 0.2286 0.3909 -0.21305 2020 8 6 59067 0.2294 0.3893 -0.21243 2020 8 7 59068 0.2302 0.3876 -0.21192 2020 8 8 59069 0.2309 0.3860 -0.21149 2020 8 9 59070 0.2316 0.3844 -0.21109 2020 8 10 59071 0.2322 0.3827 -0.21068 2020 8 11 59072 0.2329 0.3810 -0.21020 2020 8 12 59073 0.2335 0.3794 -0.20963 2020 8 13 59074 0.2341 0.3777 -0.20895 2020 8 14 59075 0.2346 0.3760 -0.20817 2020 8 15 59076 0.2351 0.3743 -0.20730 2020 8 16 59077 0.2356 0.3726 -0.20640 2020 8 17 59078 0.2360 0.3708 -0.20555 2020 8 18 59079 0.2364 0.3691 -0.20486 2020 8 19 59080 0.2368 0.3674 -0.20439 2020 8 20 59081 0.2371 0.3656 -0.20419 2020 8 21 59082 0.2375 0.3639 -0.20424 2020 8 22 59083 0.2377 0.3621 -0.20446 2020 8 23 59084 0.2380 0.3604 -0.20472 2020 8 24 59085 0.2382 0.3586 -0.20488 2020 8 25 59086 0.2384 0.3568 -0.20486 2020 8 26 59087 0.2385 0.3551 -0.20462 2020 8 27 59088 0.2386 0.3533 -0.20416 2020 8 28 59089 0.2387 0.3515 -0.20356 2020 8 29 59090 0.2387 0.3498 -0.20289 2020 8 30 59091 0.2387 0.3480 -0.20225 2020 8 31 59092 0.2387 0.3462 -0.20168 2020 9 1 59093 0.2386 0.3444 -0.20124 2020 9 2 59094 0.2385 0.3427 -0.20095 2020 9 3 59095 0.2384 0.3409 -0.20078 2020 9 4 59096 0.2383 0.3391 -0.20072 2020 9 5 59097 0.2381 0.3374 -0.20070 2020 9 6 59098 0.2378 0.3356 -0.20070 2020 9 7 59099 0.2376 0.3338 -0.20065 2020 9 8 59100 0.2373 0.3321 -0.20051 2020 9 9 59101 0.2369 0.3303 -0.20028 2020 9 10 59102 0.2366 0.3286 -0.19995 2020 9 11 59103 0.2362 0.3268 -0.19953 2020 9 12 59104 0.2357 0.3251 -0.19907 2020 9 13 59105 0.2353 0.3234 -0.19863 2020 9 14 59106 0.2348 0.3216 -0.19829 2020 9 15 59107 0.2342 0.3199 -0.19815 2020 9 16 59108 0.2337 0.3182 -0.19829 2020 9 17 59109 0.2331 0.3165 -0.19872 2020 9 18 59110 0.2324 0.3149 -0.19939 2020 9 19 59111 0.2318 0.3132 -0.20017 2020 9 20 59112 0.2311 0.3115 -0.20091 2020 9 21 59113 0.2303 0.3099 -0.20148 2020 9 22 59114 0.2296 0.3082 -0.20181 2020 9 23 59115 0.2288 0.3066 -0.20189 2020 9 24 59116 0.2280 0.3050 -0.20178 2020 9 25 59117 0.2271 0.3034 -0.20157 2020 9 26 59118 0.2262 0.3018 -0.20136 2020 9 27 59119 0.2253 0.3002 -0.20121 2020 9 28 59120 0.2244 0.2986 -0.20118 2020 9 29 59121 0.2234 0.2971 -0.20129 2020 9 30 59122 0.2224 0.2955 -0.20154 2020 10 1 59123 0.2213 0.2940 -0.20190 2020 10 2 59124 0.2203 0.2925 -0.20232 2020 10 3 59125 0.2192 0.2910 -0.20276 2020 10 4 59126 0.2180 0.2896 -0.20317 2020 10 5 59127 0.2169 0.2881 -0.20349 2020 10 6 59128 0.2157 0.2867 -0.20371 2020 10 7 59129 0.2145 0.2853 -0.20381 2020 10 8 59130 0.2132 0.2839 -0.20381 2020 10 9 59131 0.2120 0.2825 -0.20374 2020 10 10 59132 0.2107 0.2812 -0.20366 2020 10 11 59133 0.2094 0.2798 -0.20365 2020 10 12 59134 0.2080 0.2785 -0.20379 2020 10 13 59135 0.2067 0.2772 -0.20417 2020 10 14 59136 0.2053 0.2760 -0.20483 2020 10 15 59137 0.2038 0.2747 -0.20578 2020 10 16 59138 0.2024 0.2735 -0.20692 2020 10 17 59139 0.2009 0.2723 -0.20811 2020 10 18 59140 0.1994 0.2711 -0.20919 2020 10 19 59141 0.1979 0.2700 -0.21004 2020 10 20 59142 0.1964 0.2689 -0.21061 2020 10 21 59143 0.1948 0.2677 -0.21095 2020 10 22 59144 0.1932 0.2667 -0.21112 2020 10 23 59145 0.1916 0.2656 -0.21125 2020 10 24 59146 0.1900 0.2646 -0.21141 2020 10 25 59147 0.1884 0.2636 -0.21168 2020 10 26 59148 0.1867 0.2626 -0.21207 2020 10 27 59149 0.1850 0.2617 -0.21260 2020 10 28 59150 0.1833 0.2607 -0.21324 2020 10 29 59151 0.1816 0.2598 -0.21396 2020 10 30 59152 0.1798 0.2590 -0.21472 2020 10 31 59153 0.1781 0.2581 -0.21545 2020 11 1 59154 0.1763 0.2573 -0.21612 2020 11 2 59155 0.1745 0.2565 -0.21669 2020 11 3 59156 0.1727 0.2558 -0.21714 2020 11 4 59157 0.1709 0.2550 -0.21747 2020 11 5 59158 0.1690 0.2544 -0.21771 2020 11 6 59159 0.1672 0.2537 -0.21789 2020 11 7 59160 0.1653 0.2530 -0.21807 2020 11 8 59161 0.1634 0.2524 -0.21833 2020 11 9 59162 0.1615 0.2519 -0.21875 2020 11 10 59163 0.1596 0.2513 -0.21938 2020 11 11 59164 0.1577 0.2508 -0.22025 2020 11 12 59165 0.1558 0.2503 -0.22133 2020 11 13 59166 0.1539 0.2498 -0.22250 2020 11 14 59167 0.1519 0.2494 -0.22363 2020 11 15 59168 0.1500 0.2490 -0.22456 2020 11 16 59169 0.1480 0.2486 -0.22521 2020 11 17 59170 0.1460 0.2483 -0.22556 2020 11 18 59171 0.1440 0.2480 -0.22567 2020 11 19 59172 0.1420 0.2477 -0.22563 2020 11 20 59173 0.1400 0.2475 -0.22556 2020 11 21 59174 0.1380 0.2473 -0.22553 2020 11 22 59175 0.1360 0.2471 -0.22559 2020 11 23 59176 0.1340 0.2470 -0.22577 2020 11 24 59177 0.1320 0.2469 -0.22606 2020 11 25 59178 0.1300 0.2468 -0.22642 2020 11 26 59179 0.1280 0.2467 -0.22682 2020 11 27 59180 0.1260 0.2467 -0.22720 2020 11 28 59181 0.1239 0.2467 -0.22751 2020 11 29 59182 0.1219 0.2468 -0.22768 2020 11 30 59183 0.1199 0.2469 -0.22768 2020 12 1 59184 0.1179 0.2470 -0.22748 2020 12 2 59185 0.1158 0.2471 -0.22710 2020 12 3 59186 0.1138 0.2473 -0.22660 2020 12 4 59187 0.1118 0.2475 -0.22607 2020 12 5 59188 0.1098 0.2477 -0.22557 2020 12 6 59189 0.1078 0.2480 -0.22518 2020 12 7 59190 0.1058 0.2483 -0.22500 2020 12 8 59191 0.1038 0.2487 -0.22505 2020 12 9 59192 0.1018 0.2490 -0.22531 2020 12 10 59193 0.0998 0.2494 -0.22570 2020 12 11 59194 0.0978 0.2499 -0.22613 2020 12 12 59195 0.0958 0.2503 -0.22645 2020 12 13 59196 0.0938 0.2508 -0.22653 2020 12 14 59197 0.0919 0.2514 -0.22643 2020 12 15 59198 0.0899 0.2519 -0.22620 2020 12 16 59199 0.0879 0.2525 -0.22586 2020 12 17 59200 0.0860 0.2531 -0.22550 2020 12 18 59201 0.0841 0.2538 -0.22524 2020 12 19 59202 0.0822 0.2545 -0.22506 2020 12 20 59203 0.0803 0.2552 -0.22493 2020 12 21 59204 0.0784 0.2559 -0.22484 2020 12 22 59205 0.0765 0.2567 -0.22481 2020 12 23 59206 0.0746 0.2575 -0.22482 2020 12 24 59207 0.0728 0.2583 -0.22481 2020 12 25 59208 0.0709 0.2592 -0.22473 2020 12 26 59209 0.0691 0.2601 -0.22459 2020 12 27 59210 0.0673 0.2610 -0.22435 2020 12 28 59211 0.0655 0.2620 -0.22401 2020 12 29 59212 0.0638 0.2629 -0.22357 2020 12 30 59213 0.0620 0.2639 -0.22311 2020 12 31 59214 0.0603 0.2650 -0.22273 2021 1 1 59215 0.0585 0.2660 -0.22241 2021 1 2 59216 0.0568 0.2671 -0.22220 2021 1 3 59217 0.0552 0.2682 -0.22220 2021 1 4 59218 0.0535 0.2694 -0.22251 2021 1 5 59219 0.0519 0.2706 -0.22304 2021 1 6 59220 0.0502 0.2718 -0.22376 2021 1 7 59221 0.0486 0.2730 -0.22462 2021 1 8 59222 0.0471 0.2742 -0.22539 2021 1 9 59223 0.0455 0.2755 -0.22604 2021 1 10 59224 0.0440 0.2768 -0.22650 2021 1 11 59225 0.0425 0.2781 -0.22672 2021 1 12 59226 0.0410 0.2795 -0.22673 2021 1 13 59227 0.0395 0.2808 -0.22671 2021 1 14 59228 0.0381 0.2822 -0.22667 2021 1 15 59229 0.0367 0.2836 -0.22669 2021 1 16 59230 0.0353 0.2851 -0.22688 2021 1 17 59231 0.0339 0.2865 -0.22723 2021 1 18 59232 0.0326 0.2880 -0.22770 2021 1 19 59233 0.0313 0.2895 -0.22821 2021 1 20 59234 0.0300 0.2910 -0.22874 2021 1 21 59235 0.0288 0.2926 -0.22926 2021 1 22 59236 0.0276 0.2941 -0.22972 2021 1 23 59237 0.0264 0.2957 -0.23000 2021 1 24 59238 0.0252 0.2973 -0.23011 2021 1 25 59239 0.0241 0.2990 -0.23007 2021 1 26 59240 0.0230 0.3006 -0.22991 2021 1 27 59241 0.0219 0.3022 -0.22973 2021 1 28 59242 0.0208 0.3039 -0.22965 2021 1 29 59243 0.0198 0.3056 -0.22972 2021 1 30 59244 0.0188 0.3073 -0.23010 2021 1 31 59245 0.0179 0.3090 -0.23071 2021 2 1 59246 0.0170 0.3108 -0.23148 2021 2 2 59247 0.0161 0.3125 -0.23240 2021 2 3 59248 0.0152 0.3143 -0.23344 2021 2 4 59249 0.0144 0.3161 -0.23443 2021 2 5 59250 0.0136 0.3179 -0.23529 2021 2 6 59251 0.0129 0.3197 -0.23601 2021 2 7 59252 0.0121 0.3215 -0.23655 2021 2 8 59253 0.0114 0.3233 -0.23692 2021 2 9 59254 0.0108 0.3252 -0.23720 2021 2 10 59255 0.0102 0.3270 -0.23747 2021 2 11 59256 0.0096 0.3289 -0.23782 2021 2 12 59257 0.0090 0.3308 -0.23830 2021 2 13 59258 0.0085 0.3326 -0.23893 2021 2 14 59259 0.0080 0.3345 -0.23969 2021 2 15 59260 0.0076 0.3364 -0.24053 2021 2 16 59261 0.0071 0.3383 -0.24139 2021 2 17 59262 0.0068 0.3402 -0.24224 2021 2 18 59263 0.0064 0.3421 -0.24301 2021 2 19 59264 0.0061 0.3441 -0.24358 2021 2 20 59265 0.0058 0.3460 -0.24401 2021 2 21 59266 0.0056 0.3479 -0.24434 2021 2 22 59267 0.0054 0.3499 -0.24457 2021 2 23 59268 0.0052 0.3518 -0.24469 2021 2 24 59269 0.0051 0.3537 -0.24488 2021 2 25 59270 0.0050 0.3557 -0.24527 2021 2 26 59271 0.0049 0.3576 -0.24582 2021 2 27 59272 0.0049 0.3596 -0.24661 2021 2 28 59273 0.0049 0.3615 -0.24764 2021 3 1 59274 0.0050 0.3635 -0.24885 2021 3 2 59275 0.0051 0.3654 -0.25011 2021 3 3 59276 0.0052 0.3674 -0.25135 2021 3 4 59277 0.0054 0.3693 -0.25248 2021 3 5 59278 0.0056 0.3713 -0.25342 2021 3 6 59279 0.0058 0.3732 -0.25416 2021 3 7 59280 0.0061 0.3751 -0.25474 2021 3 8 59281 0.0064 0.3771 -0.25517 2021 3 9 59282 0.0067 0.3790 -0.25558 2021 3 10 59283 0.0071 0.3809 -0.25608 2021 3 11 59284 0.0075 0.3828 -0.25675 2021 3 12 59285 0.0079 0.3847 -0.25755 2021 3 13 59286 0.0084 0.3866 -0.25847 2021 3 14 59287 0.0089 0.3885 -0.25952 2021 3 15 59288 0.0095 0.3904 -0.26070 2021 3 16 59289 0.0101 0.3923 -0.26192 2021 3 17 59290 0.0107 0.3942 -0.26306 2021 3 18 59291 0.0114 0.3960 -0.26410 2021 3 19 59292 0.0121 0.3979 -0.26500 2021 3 20 59293 0.0128 0.3997 -0.26574 2021 3 21 59294 0.0136 0.4015 -0.26641 2021 3 22 59295 0.0144 0.4034 -0.26703 2021 3 23 59296 0.0152 0.4052 -0.26769 2021 3 24 59297 0.0161 0.4070 -0.26848 2021 3 25 59298 0.0170 0.4087 -0.26943 2021 3 26 59299 0.0179 0.4105 -0.27065 2021 3 27 59300 0.0189 0.4122 -0.27216 2021 3 28 59301 0.0199 0.4140 -0.27391 2021 3 29 59302 0.0209 0.4157 -0.27581 2021 3 30 59303 0.0219 0.4174 -0.27773 2021 3 31 59304 0.0230 0.4191 -0.27947 2021 4 1 59305 0.0242 0.4207 -0.28097 2021 4 2 59306 0.0253 0.4224 -0.28222 2021 4 3 59307 0.0265 0.4240 -0.28323 2021 4 4 59308 0.0277 0.4256 -0.28404 2021 4 5 59309 0.0290 0.4272 -0.28479 2021 4 6 59310 0.0303 0.4288 -0.28557 2021 4 7 59311 0.0316 0.4304 -0.28644 2021 4 8 59312 0.0329 0.4319 -0.28744 2021 4 9 59313 0.0343 0.4334 -0.28860 2021 4 10 59314 0.0357 0.4349 -0.28990 2021 4 11 59315 0.0371 0.4364 -0.29129 2021 4 12 59316 0.0386 0.4378 -0.29267 2021 4 13 59317 0.0401 0.4393 -0.29394 2021 4 14 59318 0.0416 0.4407 -0.29508 2021 4 15 59319 0.0431 0.4420 -0.29610 2021 4 16 59320 0.0447 0.4434 -0.29691 2021 4 17 59321 0.0463 0.4447 -0.29757 2021 4 18 59322 0.0479 0.4460 -0.29812 2021 4 19 59323 0.0495 0.4473 -0.29861 2021 4 20 59324 0.0512 0.4486 -0.29915 2021 4 21 59325 0.0529 0.4498 -0.29981 2021 4 22 59326 0.0546 0.4510 -0.30068 2021 4 23 59327 0.0563 0.4522 -0.30182 2021 4 24 59328 0.0581 0.4533 -0.30324 2021 4 25 59329 0.0599 0.4544 -0.30484 2021 4 26 59330 0.0617 0.4555 -0.30650 2021 4 27 59331 0.0635 0.4566 -0.30812 2021 4 28 59332 0.0653 0.4576 -0.30956 2021 4 29 59333 0.0672 0.4586 -0.31071 2021 4 30 59334 0.0691 0.4596 -0.31164 These predictions are based on all announced leap seconds. 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).