********************************************************************** * * * I E R S B U L L E T I N - A * * * * Rapid Service/Prediction of Earth Orientation * ********************************************************************** 16 April 2020 Vol. XXXIII No. 016 ______________________________________________________________________ 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 estimated * * as 30 April 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 directly * * contact the USNO PAO Geoff Chester at email address * * 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 10 58949 0.05813 .00009 0.41200 .00009 -0.234630 0.000016 20 4 11 58950 0.05857 .00009 0.41297 .00009 -0.235771 0.000017 20 4 12 58951 0.05910 .00009 0.41406 .00009 -0.236626 0.000017 20 4 13 58952 0.05987 .00009 0.41537 .00009 -0.237224 0.000007 20 4 14 58953 0.06091 .00009 0.41673 .00009 -0.237607 0.000008 20 4 15 58954 0.06197 .00009 0.41813 .00009 -0.237841 0.000007 20 4 16 58955 0.06281 .00009 0.41970 .00009 -0.238029 0.000006 _______________________________________________________________________ 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 = 0.1290 - 0.0822 cos A + 0.0628 sin A + 0.0175 cos C + 0.0085 sin C y = 0.3523 + 0.0583 cos A + 0.0752 sin A + 0.0085 cos C - 0.0175 sin C UT1-UTC = -0.2090 - 0.00017 (MJD - 58963) - (UT2-UT1) where A = 2*pi*(MJD-58955)/365.25 and C = 2*pi*(MJD-58955)/435. TAI-UTC(MJD 58956) = 37.0 The accuracy may be estimated from the expressions: S x,y = 0.00068 (MJD-58955)**0.80 S t = 0.00025 (MJD-58955)**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 4 17 58956 0.0636 0.4211 -0.23832 2020 4 18 58957 0.0644 0.4225 -0.23873 2020 4 19 58958 0.0653 0.4237 -0.23922 2020 4 20 58959 0.0663 0.4247 -0.23977 2020 4 21 58960 0.0675 0.4257 -0.24034 2020 4 22 58961 0.0687 0.4266 -0.24093 2020 4 23 58962 0.0701 0.4274 -0.24149 2020 4 24 58963 0.0715 0.4284 -0.24199 2020 4 25 58964 0.0729 0.4293 -0.24236 2020 4 26 58965 0.0743 0.4303 -0.24259 2020 4 27 58966 0.0757 0.4311 -0.24270 2020 4 28 58967 0.0771 0.4319 -0.24273 2020 4 29 58968 0.0785 0.4327 -0.24272 2020 4 30 58969 0.0800 0.4334 -0.24279 2020 5 1 58970 0.0815 0.4341 -0.24303 2020 5 2 58971 0.0831 0.4348 -0.24351 2020 5 3 58972 0.0847 0.4355 -0.24426 2020 5 4 58973 0.0863 0.4362 -0.24525 2020 5 5 58974 0.0879 0.4368 -0.24638 2020 5 6 58975 0.0895 0.4375 -0.24752 2020 5 7 58976 0.0911 0.4381 -0.24851 2020 5 8 58977 0.0928 0.4387 -0.24923 2020 5 9 58978 0.0944 0.4392 -0.24964 2020 5 10 58979 0.0961 0.4397 -0.24977 2020 5 11 58980 0.0978 0.4402 -0.24970 2020 5 12 58981 0.0995 0.4407 -0.24953 2020 5 13 58982 0.1013 0.4412 -0.24936 2020 5 14 58983 0.1030 0.4416 -0.24926 2020 5 15 58984 0.1047 0.4420 -0.24925 2020 5 16 58985 0.1065 0.4424 -0.24935 2020 5 17 58986 0.1082 0.4428 -0.24955 2020 5 18 58987 0.1100 0.4431 -0.24982 2020 5 19 58988 0.1118 0.4434 -0.25013 2020 5 20 58989 0.1136 0.4437 -0.25043 2020 5 21 58990 0.1154 0.4439 -0.25066 2020 5 22 58991 0.1171 0.4441 -0.25078 2020 5 23 58992 0.1189 0.4443 -0.25077 2020 5 24 58993 0.1207 0.4445 -0.25061 2020 5 25 58994 0.1226 0.4446 -0.25034 2020 5 26 58995 0.1244 0.4447 -0.25000 2020 5 27 58996 0.1262 0.4448 -0.24966 2020 5 28 58997 0.1280 0.4448 -0.24939 2020 5 29 58998 0.1298 0.4449 -0.24927 2020 5 30 58999 0.1316 0.4448 -0.24935 2020 5 31 59000 0.1334 0.4448 -0.24963 2020 6 1 59001 0.1353 0.4447 -0.25008 2020 6 2 59002 0.1371 0.4446 -0.25060 2020 6 3 59003 0.1389 0.4445 -0.25107 2020 6 4 59004 0.1407 0.4444 -0.25137 2020 6 5 59005 0.1425 0.4442 -0.25143 2020 6 6 59006 0.1443 0.4440 -0.25125 2020 6 7 59007 0.1461 0.4437 -0.25087 2020 6 8 59008 0.1479 0.4435 -0.25038 2020 6 9 59009 0.1497 0.4432 -0.24988 2020 6 10 59010 0.1515 0.4428 -0.24942 2020 6 11 59011 0.1533 0.4425 -0.24905 2020 6 12 59012 0.1551 0.4421 -0.24880 2020 6 13 59013 0.1569 0.4417 -0.24863 2020 6 14 59014 0.1587 0.4413 -0.24852 2020 6 15 59015 0.1604 0.4408 -0.24843 2020 6 16 59016 0.1622 0.4403 -0.24832 2020 6 17 59017 0.1639 0.4398 -0.24814 2020 6 18 59018 0.1657 0.4392 -0.24785 2020 6 19 59019 0.1674 0.4386 -0.24743 2020 6 20 59020 0.1691 0.4380 -0.24687 2020 6 21 59021 0.1708 0.4374 -0.24619 2020 6 22 59022 0.1725 0.4367 -0.24543 2020 6 23 59023 0.1742 0.4361 -0.24466 2020 6 24 59024 0.1759 0.4353 -0.24396 2020 6 25 59025 0.1775 0.4346 -0.24341 2020 6 26 59026 0.1792 0.4338 -0.24305 2020 6 27 59027 0.1808 0.4330 -0.24289 2020 6 28 59028 0.1824 0.4322 -0.24289 2020 6 29 59029 0.1840 0.4314 -0.24295 2020 6 30 59030 0.1856 0.4305 -0.24299 2020 7 1 59031 0.1872 0.4296 -0.24290 2020 7 2 59032 0.1887 0.4287 -0.24259 2020 7 3 59033 0.1903 0.4278 -0.24205 2020 7 4 59034 0.1918 0.4268 -0.24130 2020 7 5 59035 0.1933 0.4258 -0.24041 2020 7 6 59036 0.1948 0.4248 -0.23947 2020 7 7 59037 0.1962 0.4237 -0.23855 2020 7 8 59038 0.1977 0.4227 -0.23771 2020 7 9 59039 0.1991 0.4216 -0.23697 2020 7 10 59040 0.2005 0.4205 -0.23634 2020 7 11 59041 0.2019 0.4194 -0.23579 2020 7 12 59042 0.2033 0.4182 -0.23528 2020 7 13 59043 0.2046 0.4170 -0.23477 2020 7 14 59044 0.2059 0.4158 -0.23423 2020 7 15 59045 0.2072 0.4146 -0.23361 2020 7 16 59046 0.2085 0.4134 -0.23288 2020 7 17 59047 0.2098 0.4121 -0.23204 2020 7 18 59048 0.2110 0.4109 -0.23107 2020 7 19 59049 0.2122 0.4096 -0.23002 2020 7 20 59050 0.2134 0.4082 -0.22894 2020 7 21 59051 0.2145 0.4069 -0.22792 2020 7 22 59052 0.2156 0.4056 -0.22704 2020 7 23 59053 0.2168 0.4042 -0.22638 2020 7 24 59054 0.2178 0.4028 -0.22595 2020 7 25 59055 0.2189 0.4014 -0.22570 2020 7 26 59056 0.2199 0.4000 -0.22556 2020 7 27 59057 0.2209 0.3985 -0.22541 2020 7 28 59058 0.2219 0.3971 -0.22516 2020 7 29 59059 0.2228 0.3956 -0.22471 2020 7 30 59060 0.2237 0.3941 -0.22405 2020 7 31 59061 0.2246 0.3926 -0.22319 2020 8 1 59062 0.2255 0.3911 -0.22218 2020 8 2 59063 0.2263 0.3896 -0.22112 2020 8 3 59064 0.2271 0.3880 -0.22011 2020 8 4 59065 0.2279 0.3865 -0.21920 2020 8 5 59066 0.2286 0.3849 -0.21841 2020 8 6 59067 0.2293 0.3833 -0.21775 2020 8 7 59068 0.2300 0.3818 -0.21719 2020 8 8 59069 0.2307 0.3802 -0.21672 2020 8 9 59070 0.2313 0.3786 -0.21628 2020 8 10 59071 0.2319 0.3769 -0.21582 2020 8 11 59072 0.2324 0.3753 -0.21531 2020 8 12 59073 0.2330 0.3737 -0.21471 2020 8 13 59074 0.2335 0.3720 -0.21401 2020 8 14 59075 0.2339 0.3704 -0.21320 2020 8 15 59076 0.2344 0.3687 -0.21231 2020 8 16 59077 0.2348 0.3670 -0.21139 2020 8 17 59078 0.2351 0.3654 -0.21052 2020 8 18 59079 0.2355 0.3637 -0.20978 2020 8 19 59080 0.2358 0.3620 -0.20928 2020 8 20 59081 0.2361 0.3603 -0.20904 2020 8 21 59082 0.2363 0.3586 -0.20905 2020 8 22 59083 0.2365 0.3569 -0.20923 2020 8 23 59084 0.2367 0.3552 -0.20944 2020 8 24 59085 0.2368 0.3535 -0.20956 2020 8 25 59086 0.2369 0.3518 -0.20949 2020 8 26 59087 0.2370 0.3501 -0.20920 2020 8 27 59088 0.2371 0.3484 -0.20870 2020 8 28 59089 0.2371 0.3467 -0.20807 2020 8 29 59090 0.2371 0.3450 -0.20736 2020 8 30 59091 0.2370 0.3433 -0.20668 2020 8 31 59092 0.2369 0.3415 -0.20609 2020 9 1 59093 0.2368 0.3398 -0.20562 2020 9 2 59094 0.2366 0.3381 -0.20531 2020 9 3 59095 0.2364 0.3364 -0.20512 2020 9 4 59096 0.2362 0.3347 -0.20504 2020 9 5 59097 0.2360 0.3330 -0.20501 2020 9 6 59098 0.2357 0.3313 -0.20500 2020 9 7 59099 0.2354 0.3296 -0.20494 2020 9 8 59100 0.2350 0.3280 -0.20480 2020 9 9 59101 0.2346 0.3263 -0.20456 2020 9 10 59102 0.2342 0.3246 -0.20423 2020 9 11 59103 0.2338 0.3229 -0.20381 2020 9 12 59104 0.2333 0.3213 -0.20334 2020 9 13 59105 0.2328 0.3196 -0.20290 2020 9 14 59106 0.2322 0.3180 -0.20257 2020 9 15 59107 0.2317 0.3164 -0.20245 2020 9 16 59108 0.2310 0.3147 -0.20260 2020 9 17 59109 0.2304 0.3131 -0.20305 2020 9 18 59110 0.2297 0.3115 -0.20373 2020 9 19 59111 0.2290 0.3099 -0.20453 2020 9 20 59112 0.2283 0.3083 -0.20529 2020 9 21 59113 0.2275 0.3068 -0.20588 2020 9 22 59114 0.2267 0.3052 -0.20623 2020 9 23 59115 0.2259 0.3037 -0.20633 2020 9 24 59116 0.2250 0.3021 -0.20624 2020 9 25 59117 0.2242 0.3006 -0.20605 2020 9 26 59118 0.2232 0.2991 -0.20585 2020 9 27 59119 0.2223 0.2976 -0.20573 2020 9 28 59120 0.2213 0.2961 -0.20572 2020 9 29 59121 0.2203 0.2947 -0.20584 2020 9 30 59122 0.2193 0.2932 -0.20611 2020 10 1 59123 0.2182 0.2918 -0.20648 2020 10 2 59124 0.2171 0.2904 -0.20692 2020 10 3 59125 0.2160 0.2890 -0.20737 2020 10 4 59126 0.2149 0.2876 -0.20779 2020 10 5 59127 0.2137 0.2862 -0.20813 2020 10 6 59128 0.2125 0.2849 -0.20836 2020 10 7 59129 0.2113 0.2836 -0.20848 2020 10 8 59130 0.2100 0.2823 -0.20850 2020 10 9 59131 0.2087 0.2810 -0.20846 2020 10 10 59132 0.2074 0.2797 -0.20841 2020 10 11 59133 0.2061 0.2785 -0.20842 2020 10 12 59134 0.2047 0.2773 -0.20859 2020 10 13 59135 0.2034 0.2760 -0.20900 2020 10 14 59136 0.2020 0.2749 -0.20970 2020 10 15 59137 0.2005 0.2737 -0.21068 2020 10 16 59138 0.1991 0.2726 -0.21185 2020 10 17 59139 0.1976 0.2715 -0.21306 2020 10 18 59140 0.1961 0.2704 -0.21416 2020 10 19 59141 0.1946 0.2693 -0.21501 2020 10 20 59142 0.1931 0.2683 -0.21558 2020 10 21 59143 0.1915 0.2672 -0.21589 2020 10 22 59144 0.1899 0.2663 -0.21602 2020 10 23 59145 0.1883 0.2653 -0.21607 2020 10 24 59146 0.1867 0.2643 -0.21615 2020 10 25 59147 0.1851 0.2634 -0.21631 2020 10 26 59148 0.1834 0.2625 -0.21658 2020 10 27 59149 0.1817 0.2617 -0.21698 2020 10 28 59150 0.1800 0.2608 -0.21747 2020 10 29 59151 0.1783 0.2600 -0.21803 2020 10 30 59152 0.1766 0.2592 -0.21859 2020 10 31 59153 0.1749 0.2585 -0.21910 2020 11 1 59154 0.1731 0.2577 -0.21951 2020 11 2 59155 0.1713 0.2570 -0.21978 2020 11 3 59156 0.1696 0.2564 -0.21988 2020 11 4 59157 0.1678 0.2557 -0.21984 2020 11 5 59158 0.1659 0.2551 -0.21969 2020 11 6 59159 0.1641 0.2545 -0.21946 2020 11 7 59160 0.1623 0.2539 -0.21923 2020 11 8 59161 0.1604 0.2534 -0.21906 2020 11 9 59162 0.1585 0.2529 -0.21903 2020 11 10 59163 0.1567 0.2524 -0.21920 2020 11 11 59164 0.1548 0.2520 -0.21960 2020 11 12 59165 0.1529 0.2516 -0.22021 2020 11 13 59166 0.1510 0.2512 -0.22093 2020 11 14 59167 0.1491 0.2508 -0.22163 2020 11 15 59168 0.1472 0.2505 -0.22216 2020 11 16 59169 0.1452 0.2502 -0.22245 2020 11 17 59170 0.1433 0.2499 -0.22251 2020 11 18 59171 0.1413 0.2497 -0.22240 2020 11 19 59172 0.1394 0.2495 -0.22224 2020 11 20 59173 0.1374 0.2493 -0.22209 2020 11 21 59174 0.1355 0.2492 -0.22200 2020 11 22 59175 0.1335 0.2491 -0.22197 2020 11 23 59176 0.1316 0.2490 -0.22200 2020 11 24 59177 0.1296 0.2489 -0.22211 2020 11 25 59178 0.1276 0.2489 -0.22228 2020 11 26 59179 0.1257 0.2489 -0.22246 2020 11 27 59180 0.1237 0.2490 -0.22263 2020 11 28 59181 0.1217 0.2490 -0.22275 2020 11 29 59182 0.1197 0.2491 -0.22278 2020 11 30 59183 0.1178 0.2493 -0.22272 2020 12 1 59184 0.1158 0.2494 -0.22254 2020 12 2 59185 0.1138 0.2496 -0.22230 2020 12 3 59186 0.1119 0.2499 -0.22208 2020 12 4 59187 0.1099 0.2501 -0.22186 2020 12 5 59188 0.1079 0.2504 -0.22170 2020 12 6 59189 0.1060 0.2507 -0.22168 2020 12 7 59190 0.1040 0.2511 -0.22195 2020 12 8 59191 0.1021 0.2515 -0.22248 2020 12 9 59192 0.1001 0.2519 -0.22326 2020 12 10 59193 0.0982 0.2523 -0.22428 2020 12 11 59194 0.0963 0.2528 -0.22531 2020 12 12 59195 0.0944 0.2533 -0.22627 2020 12 13 59196 0.0924 0.2538 -0.22705 2020 12 14 59197 0.0905 0.2544 -0.22756 2020 12 15 59198 0.0887 0.2550 -0.22778 2020 12 16 59199 0.0868 0.2556 -0.22789 2020 12 17 59200 0.0849 0.2562 -0.22790 2020 12 18 59201 0.0830 0.2569 -0.22791 2020 12 19 59202 0.0812 0.2576 -0.22806 2020 12 20 59203 0.0794 0.2584 -0.22835 2020 12 21 59204 0.0775 0.2591 -0.22877 2020 12 22 59205 0.0757 0.2599 -0.22926 2020 12 23 59206 0.0739 0.2608 -0.22979 2020 12 24 59207 0.0721 0.2616 -0.23035 2020 12 25 59208 0.0704 0.2625 -0.23086 2020 12 26 59209 0.0686 0.2634 -0.23121 2020 12 27 59210 0.0669 0.2643 -0.23139 2020 12 28 59211 0.0652 0.2653 -0.23141 2020 12 29 59212 0.0635 0.2663 -0.23126 2020 12 30 59213 0.0618 0.2673 -0.23105 2020 12 31 59214 0.0601 0.2684 -0.23086 2021 1 1 59215 0.0585 0.2694 -0.23076 2021 1 2 59216 0.0568 0.2705 -0.23089 2021 1 3 59217 0.0552 0.2717 -0.23120 2021 1 4 59218 0.0536 0.2728 -0.23166 2021 1 5 59219 0.0521 0.2740 -0.23232 2021 1 6 59220 0.0505 0.2752 -0.23318 2021 1 7 59221 0.0490 0.2764 -0.23410 2021 1 8 59222 0.0475 0.2776 -0.23497 2021 1 9 59223 0.0460 0.2789 -0.23575 2021 1 10 59224 0.0446 0.2802 -0.23634 2021 1 11 59225 0.0431 0.2815 -0.23671 2021 1 12 59226 0.0417 0.2828 -0.23691 2021 1 13 59227 0.0403 0.2842 -0.23702 2021 1 14 59228 0.0390 0.2856 -0.23714 2021 1 15 59229 0.0376 0.2870 -0.23735 2021 1 16 59230 0.0363 0.2884 -0.23770 2021 1 17 59231 0.0350 0.2899 -0.23817 2021 1 18 59232 0.0338 0.2913 -0.23875 2021 1 19 59233 0.0326 0.2928 -0.23938 2021 1 20 59234 0.0314 0.2943 -0.24002 2021 1 21 59235 0.0302 0.2958 -0.24061 2021 1 22 59236 0.0290 0.2974 -0.24103 2021 1 23 59237 0.0279 0.2989 -0.24132 2021 1 24 59238 0.0268 0.3005 -0.24150 2021 1 25 59239 0.0258 0.3021 -0.24155 2021 1 26 59240 0.0247 0.3037 -0.24146 2021 1 27 59241 0.0237 0.3053 -0.24139 2021 1 28 59242 0.0228 0.3070 -0.24146 2021 1 29 59243 0.0218 0.3086 -0.24161 2021 1 30 59244 0.0209 0.3103 -0.24195 2021 1 31 59245 0.0200 0.3120 -0.24251 2021 2 1 59246 0.0192 0.3137 -0.24326 2021 2 2 59247 0.0183 0.3154 -0.24412 2021 2 3 59248 0.0176 0.3171 -0.24505 2021 2 4 59249 0.0168 0.3189 -0.24598 2021 2 5 59250 0.0161 0.3206 -0.24679 2021 2 6 59251 0.0154 0.3224 -0.24743 2021 2 7 59252 0.0147 0.3242 -0.24788 2021 2 8 59253 0.0141 0.3259 -0.24814 2021 2 9 59254 0.0135 0.3277 -0.24830 2021 2 10 59255 0.0130 0.3295 -0.24848 2021 2 11 59256 0.0124 0.3314 -0.24882 2021 2 12 59257 0.0120 0.3332 -0.24927 2021 2 13 59258 0.0115 0.3350 -0.24986 2021 2 14 59259 0.0111 0.3368 -0.25060 2021 2 15 59260 0.0107 0.3387 -0.25150 2021 2 16 59261 0.0103 0.3405 -0.25249 2021 2 17 59262 0.0100 0.3424 -0.25345 2021 2 18 59263 0.0097 0.3442 -0.25433 2021 2 19 59264 0.0095 0.3461 -0.25510 2021 2 20 59265 0.0093 0.3480 -0.25572 2021 2 21 59266 0.0091 0.3498 -0.25625 2021 2 22 59267 0.0089 0.3517 -0.25672 2021 2 23 59268 0.0088 0.3536 -0.25720 2021 2 24 59269 0.0088 0.3555 -0.25776 2021 2 25 59270 0.0087 0.3574 -0.25843 2021 2 26 59271 0.0087 0.3592 -0.25934 2021 2 27 59272 0.0087 0.3611 -0.26052 2021 2 28 59273 0.0088 0.3630 -0.26193 2021 3 1 59274 0.0089 0.3649 -0.26355 2021 3 2 59275 0.0091 0.3668 -0.26525 2021 3 3 59276 0.0092 0.3686 -0.26687 2021 3 4 59277 0.0094 0.3705 -0.26832 2021 3 5 59278 0.0097 0.3724 -0.26958 2021 3 6 59279 0.0100 0.3742 -0.27059 2021 3 7 59280 0.0103 0.3761 -0.27138 2021 3 8 59281 0.0106 0.3780 -0.27206 2021 3 9 59282 0.0110 0.3798 -0.27272 2021 3 10 59283 0.0114 0.3817 -0.27343 2021 3 11 59284 0.0119 0.3835 -0.27428 2021 3 12 59285 0.0124 0.3853 -0.27530 2021 3 13 59286 0.0129 0.3872 -0.27651 2021 3 14 59287 0.0134 0.3890 -0.27785 2021 3 15 59288 0.0140 0.3908 -0.27924 2021 3 16 59289 0.0147 0.3926 -0.28057 2021 3 17 59290 0.0153 0.3944 -0.28182 2021 3 18 59291 0.0160 0.3962 -0.28298 2021 3 19 59292 0.0167 0.3979 -0.28394 2021 3 20 59293 0.0175 0.3997 -0.28476 2021 3 21 59294 0.0183 0.4014 -0.28546 2021 3 22 59295 0.0191 0.4032 -0.28607 2021 3 23 59296 0.0200 0.4049 -0.28670 2021 3 24 59297 0.0209 0.4066 -0.28742 2021 3 25 59298 0.0218 0.4083 -0.28832 2021 3 26 59299 0.0228 0.4100 -0.28948 2021 3 27 59300 0.0237 0.4117 -0.29092 2021 3 28 59301 0.0248 0.4133 -0.29259 2021 3 29 59302 0.0258 0.4149 -0.29439 2021 3 30 59303 0.0269 0.4166 -0.29621 2021 3 31 59304 0.0280 0.4182 -0.29794 2021 4 1 59305 0.0292 0.4198 -0.29943 2021 4 2 59306 0.0303 0.4213 -0.30070 2021 4 3 59307 0.0316 0.4229 -0.30174 2021 4 4 59308 0.0328 0.4244 -0.30259 2021 4 5 59309 0.0341 0.4259 -0.30334 2021 4 6 59310 0.0353 0.4274 -0.30408 2021 4 7 59311 0.0367 0.4289 -0.30490 2021 4 8 59312 0.0380 0.4303 -0.30588 2021 4 9 59313 0.0394 0.4318 -0.30699 2021 4 10 59314 0.0408 0.4332 -0.30823 2021 4 11 59315 0.0422 0.4346 -0.30952 2021 4 12 59316 0.0437 0.4359 -0.31075 2021 4 13 59317 0.0452 0.4373 -0.31190 2021 4 14 59318 0.0467 0.4386 -0.31289 2021 4 15 59319 0.0482 0.4399 -0.31370 2021 4 16 59320 0.0498 0.4412 -0.31436 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).