********************************************************************** * * * I E R S B U L L E T I N - A * * * * Rapid Service/Prediction of Earth Orientation * ********************************************************************** 10 September 2020 Vol. XXXIII No. 037 ______________________________________________________________________ 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 *********************************************************************** * * * There will NOT be a leap second introduced * * in UTC on 31 December 2020 * * * * 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. * * * * Until 31 Oct 2020, 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. * * * * Please note that CDDIS is reporting that as of 31 Oct 2020, all * * unencrypted ftp service will be permanently discontinued at CDDIS. * * * * 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 9 4 59096 0.21326 .00009 0.35609 .00009 -0.183010 0.000017 20 9 5 59097 0.21269 .00009 0.35449 .00009 -0.182437 0.000017 20 9 6 59098 0.21222 .00009 0.35316 .00009 -0.181867 0.000017 20 9 7 59099 0.21173 .00009 0.35179 .00009 -0.181303 0.000014 20 9 8 59100 0.21124 .00009 0.35043 .00009 -0.180673 0.000016 20 9 9 59101 0.21094 .00009 0.34946 .00009 -0.179941 0.000014 20 9 10 59102 0.21076 .00009 0.34889 .00009 -0.179115 0.000015 _______________________________________________________________________ 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 = 0.1202 + 0.0830 cos A - 0.0140 sin A + 0.0070 cos C + 0.0022 sin C y = 0.3609 - 0.0143 cos A - 0.0783 sin A + 0.0022 cos C - 0.0070 sin C UT1-UTC = -0.1934 - 0.00007 (MJD - 59110) - (UT2-UT1) where A = 2*pi*(MJD-59102)/365.25 and C = 2*pi*(MJD-59102)/435. TAI-UTC(MJD 59103) = 37.0 The accuracy may be estimated from the expressions: S x,y = 0.00068 (MJD-59102)**0.80 S t = 0.00025 (MJD-59102)**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 9 11 59103 0.2104 0.3482 -0.17826 2020 9 12 59104 0.2101 0.3474 -0.17739 2020 9 13 59105 0.2097 0.3465 -0.17656 2020 9 14 59106 0.2093 0.3455 -0.17585 2020 9 15 59107 0.2089 0.3443 -0.17536 2020 9 16 59108 0.2085 0.3430 -0.17514 2020 9 17 59109 0.2081 0.3418 -0.17520 2020 9 18 59110 0.2078 0.3406 -0.17550 2020 9 19 59111 0.2074 0.3394 -0.17592 2020 9 20 59112 0.2070 0.3382 -0.17630 2020 9 21 59113 0.2066 0.3370 -0.17652 2020 9 22 59114 0.2061 0.3357 -0.17647 2020 9 23 59115 0.2056 0.3345 -0.17615 2020 9 24 59116 0.2051 0.3332 -0.17561 2020 9 25 59117 0.2045 0.3319 -0.17495 2020 9 26 59118 0.2040 0.3307 -0.17426 2020 9 27 59119 0.2035 0.3295 -0.17361 2020 9 28 59120 0.2029 0.3282 -0.17306 2020 9 29 59121 0.2023 0.3270 -0.17265 2020 9 30 59122 0.2017 0.3258 -0.17239 2020 10 1 59123 0.2010 0.3245 -0.17226 2020 10 2 59124 0.2003 0.3233 -0.17223 2020 10 3 59125 0.1996 0.3221 -0.17223 2020 10 4 59126 0.1989 0.3209 -0.17221 2020 10 5 59127 0.1981 0.3197 -0.17212 2020 10 6 59128 0.1973 0.3185 -0.17195 2020 10 7 59129 0.1965 0.3173 -0.17169 2020 10 8 59130 0.1957 0.3162 -0.17137 2020 10 9 59131 0.1948 0.3150 -0.17102 2020 10 10 59132 0.1939 0.3139 -0.17069 2020 10 11 59133 0.1930 0.3128 -0.17045 2020 10 12 59134 0.1921 0.3117 -0.17038 2020 10 13 59135 0.1912 0.3106 -0.17056 2020 10 14 59136 0.1902 0.3095 -0.17103 2020 10 15 59137 0.1892 0.3084 -0.17177 2020 10 16 59138 0.1882 0.3074 -0.17268 2020 10 17 59139 0.1871 0.3063 -0.17364 2020 10 18 59140 0.1861 0.3053 -0.17449 2020 10 19 59141 0.1850 0.3043 -0.17509 2020 10 20 59142 0.1839 0.3033 -0.17541 2020 10 21 59143 0.1827 0.3024 -0.17547 2020 10 22 59144 0.1816 0.3014 -0.17536 2020 10 23 59145 0.1804 0.3005 -0.17518 2020 10 24 59146 0.1792 0.2996 -0.17504 2020 10 25 59147 0.1780 0.2987 -0.17498 2020 10 26 59148 0.1768 0.2978 -0.17504 2020 10 27 59149 0.1755 0.2969 -0.17522 2020 10 28 59150 0.1743 0.2961 -0.17551 2020 10 29 59151 0.1730 0.2953 -0.17586 2020 10 30 59152 0.1717 0.2945 -0.17623 2020 10 31 59153 0.1704 0.2937 -0.17657 2020 11 1 59154 0.1690 0.2930 -0.17683 2020 11 2 59155 0.1677 0.2922 -0.17697 2020 11 3 59156 0.1663 0.2915 -0.17698 2020 11 4 59157 0.1649 0.2908 -0.17686 2020 11 5 59158 0.1635 0.2902 -0.17665 2020 11 6 59159 0.1621 0.2895 -0.17640 2020 11 7 59160 0.1607 0.2889 -0.17616 2020 11 8 59161 0.1593 0.2883 -0.17604 2020 11 9 59162 0.1578 0.2877 -0.17611 2020 11 10 59163 0.1564 0.2872 -0.17644 2020 11 11 59164 0.1549 0.2866 -0.17705 2020 11 12 59165 0.1534 0.2861 -0.17789 2020 11 13 59166 0.1519 0.2856 -0.17886 2020 11 14 59167 0.1504 0.2852 -0.17982 2020 11 15 59168 0.1489 0.2847 -0.18062 2020 11 16 59169 0.1473 0.2843 -0.18117 2020 11 17 59170 0.1458 0.2839 -0.18145 2020 11 18 59171 0.1443 0.2836 -0.18154 2020 11 19 59172 0.1427 0.2832 -0.18153 2020 11 20 59173 0.1412 0.2829 -0.18152 2020 11 21 59174 0.1396 0.2826 -0.18158 2020 11 22 59175 0.1380 0.2824 -0.18177 2020 11 23 59176 0.1364 0.2821 -0.18207 2020 11 24 59177 0.1348 0.2819 -0.18248 2020 11 25 59178 0.1332 0.2817 -0.18295 2020 11 26 59179 0.1317 0.2816 -0.18344 2020 11 27 59180 0.1301 0.2814 -0.18390 2020 11 28 59181 0.1284 0.2813 -0.18429 2020 11 29 59182 0.1268 0.2813 -0.18456 2020 11 30 59183 0.1252 0.2812 -0.18469 2020 12 1 59184 0.1236 0.2812 -0.18467 2020 12 2 59185 0.1220 0.2812 -0.18453 2020 12 3 59186 0.1204 0.2812 -0.18432 2020 12 4 59187 0.1188 0.2812 -0.18410 2020 12 5 59188 0.1172 0.2813 -0.18394 2020 12 6 59189 0.1156 0.2814 -0.18393 2020 12 7 59190 0.1139 0.2815 -0.18413 2020 12 8 59191 0.1123 0.2817 -0.18457 2020 12 9 59192 0.1107 0.2818 -0.18523 2020 12 10 59193 0.1091 0.2820 -0.18604 2020 12 11 59194 0.1075 0.2823 -0.18688 2020 12 12 59195 0.1059 0.2825 -0.18762 2020 12 13 59196 0.1043 0.2828 -0.18816 2020 12 14 59197 0.1027 0.2831 -0.18843 2020 12 15 59198 0.1012 0.2834 -0.18846 2020 12 16 59199 0.0996 0.2838 -0.18834 2020 12 17 59200 0.0980 0.2842 -0.18818 2020 12 18 59201 0.0964 0.2846 -0.18806 2020 12 19 59202 0.0949 0.2850 -0.18804 2020 12 20 59203 0.0933 0.2855 -0.18815 2020 12 21 59204 0.0918 0.2859 -0.18837 2020 12 22 59205 0.0903 0.2864 -0.18866 2020 12 23 59206 0.0887 0.2870 -0.18898 2020 12 24 59207 0.0872 0.2875 -0.18928 2020 12 25 59208 0.0857 0.2881 -0.18953 2020 12 26 59209 0.0842 0.2887 -0.18967 2020 12 27 59210 0.0827 0.2893 -0.18969 2020 12 28 59211 0.0813 0.2900 -0.18948 2020 12 29 59212 0.0798 0.2907 -0.18915 2020 12 30 59213 0.0784 0.2914 -0.18874 2020 12 31 59214 0.0769 0.2921 -0.18831 2021 1 1 59215 0.0755 0.2928 -0.18794 2021 1 2 59216 0.0741 0.2936 -0.18771 2021 1 3 59217 0.0727 0.2944 -0.18768 2021 1 4 59218 0.0714 0.2952 -0.18788 2021 1 5 59219 0.0700 0.2961 -0.18828 2021 1 6 59220 0.0687 0.2969 -0.18884 2021 1 7 59221 0.0673 0.2978 -0.18944 2021 1 8 59222 0.0660 0.2987 -0.18998 2021 1 9 59223 0.0647 0.2996 -0.19037 2021 1 10 59224 0.0635 0.3006 -0.19053 2021 1 11 59225 0.0622 0.3015 -0.19049 2021 1 12 59226 0.0610 0.3025 -0.19028 2021 1 13 59227 0.0598 0.3035 -0.19002 2021 1 14 59228 0.0586 0.3046 -0.18979 2021 1 15 59229 0.0574 0.3056 -0.18967 2021 1 16 59230 0.0562 0.3067 -0.18970 2021 1 17 59231 0.0551 0.3078 -0.18985 2021 1 18 59232 0.0540 0.3089 -0.19011 2021 1 19 59233 0.0529 0.3100 -0.19043 2021 1 20 59234 0.0518 0.3112 -0.19074 2021 1 21 59235 0.0508 0.3123 -0.19100 2021 1 22 59236 0.0497 0.3135 -0.19117 2021 1 23 59237 0.0487 0.3147 -0.19122 2021 1 24 59238 0.0478 0.3159 -0.19115 2021 1 25 59239 0.0468 0.3171 -0.19096 2021 1 26 59240 0.0459 0.3184 -0.19069 2021 1 27 59241 0.0450 0.3196 -0.19039 2021 1 28 59242 0.0441 0.3209 -0.19014 2021 1 29 59243 0.0432 0.3222 -0.19002 2021 1 30 59244 0.0424 0.3235 -0.19012 2021 1 31 59245 0.0416 0.3248 -0.19047 2021 2 1 59246 0.0408 0.3262 -0.19104 2021 2 2 59247 0.0400 0.3275 -0.19179 2021 2 3 59248 0.0393 0.3289 -0.19259 2021 2 4 59249 0.0386 0.3302 -0.19335 2021 2 5 59250 0.0379 0.3316 -0.19396 2021 2 6 59251 0.0373 0.3330 -0.19436 2021 2 7 59252 0.0366 0.3344 -0.19455 2021 2 8 59253 0.0360 0.3358 -0.19458 2021 2 9 59254 0.0355 0.3373 -0.19453 2021 2 10 59255 0.0349 0.3387 -0.19450 2021 2 11 59256 0.0344 0.3402 -0.19457 2021 2 12 59257 0.0339 0.3416 -0.19479 2021 2 13 59258 0.0335 0.3431 -0.19517 2021 2 14 59259 0.0331 0.3446 -0.19567 2021 2 15 59260 0.0327 0.3460 -0.19626 2021 2 16 59261 0.0323 0.3475 -0.19686 2021 2 17 59262 0.0319 0.3490 -0.19744 2021 2 18 59263 0.0316 0.3505 -0.19793 2021 2 19 59264 0.0314 0.3520 -0.19831 2021 2 20 59265 0.0311 0.3536 -0.19855 2021 2 21 59266 0.0309 0.3551 -0.19868 2021 2 22 59267 0.0307 0.3566 -0.19871 2021 2 23 59268 0.0305 0.3581 -0.19870 2021 2 24 59269 0.0304 0.3597 -0.19872 2021 2 25 59270 0.0303 0.3612 -0.19885 2021 2 26 59271 0.0302 0.3627 -0.19917 2021 2 27 59272 0.0302 0.3643 -0.19976 2021 2 28 59273 0.0302 0.3658 -0.20062 2021 3 1 59274 0.0302 0.3674 -0.20170 2021 3 2 59275 0.0302 0.3689 -0.20288 2021 3 3 59276 0.0303 0.3705 -0.20403 2021 3 4 59277 0.0304 0.3720 -0.20503 2021 3 5 59278 0.0306 0.3736 -0.20581 2021 3 6 59279 0.0307 0.3751 -0.20634 2021 3 7 59280 0.0309 0.3767 -0.20669 2021 3 8 59281 0.0312 0.3782 -0.20692 2021 3 9 59282 0.0314 0.3797 -0.20714 2021 3 10 59283 0.0317 0.3813 -0.20742 2021 3 11 59284 0.0321 0.3828 -0.20784 2021 3 12 59285 0.0324 0.3843 -0.20841 2021 3 13 59286 0.0328 0.3859 -0.20911 2021 3 14 59287 0.0332 0.3874 -0.20990 2021 3 15 59288 0.0336 0.3889 -0.21073 2021 3 16 59289 0.0341 0.3904 -0.21152 2021 3 17 59290 0.0346 0.3919 -0.21222 2021 3 18 59291 0.0351 0.3934 -0.21279 2021 3 19 59292 0.0357 0.3949 -0.21321 2021 3 20 59293 0.0363 0.3964 -0.21347 2021 3 21 59294 0.0369 0.3979 -0.21361 2021 3 22 59295 0.0376 0.3993 -0.21366 2021 3 23 59296 0.0382 0.4008 -0.21370 2021 3 24 59297 0.0390 0.4022 -0.21381 2021 3 25 59298 0.0397 0.4037 -0.21409 2021 3 26 59299 0.0405 0.4051 -0.21462 2021 3 27 59300 0.0412 0.4065 -0.21544 2021 3 28 59301 0.0421 0.4079 -0.21655 2021 3 29 59302 0.0429 0.4093 -0.21784 2021 3 30 59303 0.0438 0.4107 -0.21920 2021 3 31 59304 0.0447 0.4121 -0.22048 2021 4 1 59305 0.0456 0.4134 -0.22157 2021 4 2 59306 0.0466 0.4148 -0.22244 2021 4 3 59307 0.0476 0.4161 -0.22309 2021 4 4 59308 0.0486 0.4174 -0.22362 2021 4 5 59309 0.0496 0.4187 -0.22410 2021 4 6 59310 0.0507 0.4200 -0.22463 2021 4 7 59311 0.0518 0.4213 -0.22526 2021 4 8 59312 0.0529 0.4225 -0.22601 2021 4 9 59313 0.0540 0.4238 -0.22689 2021 4 10 59314 0.0552 0.4250 -0.22785 2021 4 11 59315 0.0564 0.4262 -0.22885 2021 4 12 59316 0.0576 0.4274 -0.22984 2021 4 13 59317 0.0588 0.4286 -0.23078 2021 4 14 59318 0.0601 0.4297 -0.23162 2021 4 15 59319 0.0613 0.4309 -0.23230 2021 4 16 59320 0.0626 0.4320 -0.23277 2021 4 17 59321 0.0640 0.4331 -0.23302 2021 4 18 59322 0.0653 0.4341 -0.23311 2021 4 19 59323 0.0667 0.4352 -0.23311 2021 4 20 59324 0.0681 0.4362 -0.23311 2021 4 21 59325 0.0695 0.4373 -0.23319 2021 4 22 59326 0.0709 0.4382 -0.23344 2021 4 23 59327 0.0724 0.4392 -0.23392 2021 4 24 59328 0.0738 0.4402 -0.23471 2021 4 25 59329 0.0753 0.4411 -0.23579 2021 4 26 59330 0.0768 0.4420 -0.23704 2021 4 27 59331 0.0784 0.4429 -0.23824 2021 4 28 59332 0.0799 0.4438 -0.23924 2021 4 29 59333 0.0815 0.4446 -0.23992 2021 4 30 59334 0.0830 0.4454 -0.24031 2021 5 1 59335 0.0846 0.4462 -0.24056 2021 5 2 59336 0.0862 0.4470 -0.24072 2021 5 3 59337 0.0879 0.4477 -0.24089 2021 5 4 59338 0.0895 0.4484 -0.24117 2021 5 5 59339 0.0912 0.4491 -0.24161 2021 5 6 59340 0.0928 0.4498 -0.24218 2021 5 7 59341 0.0945 0.4505 -0.24291 2021 5 8 59342 0.0962 0.4511 -0.24374 2021 5 9 59343 0.0979 0.4517 -0.24465 2021 5 10 59344 0.0996 0.4522 -0.24555 2021 5 11 59345 0.1014 0.4528 -0.24634 2021 5 12 59346 0.1031 0.4533 -0.24698 2021 5 13 59347 0.1049 0.4538 -0.24746 2021 5 14 59348 0.1066 0.4543 -0.24776 2021 5 15 59349 0.1084 0.4547 -0.24794 2021 5 16 59350 0.1102 0.4551 -0.24807 2021 5 17 59351 0.1120 0.4555 -0.24824 2021 5 18 59352 0.1138 0.4558 -0.24847 2021 5 19 59353 0.1156 0.4562 -0.24881 2021 5 20 59354 0.1174 0.4565 -0.24928 2021 5 21 59355 0.1193 0.4567 -0.24991 2021 5 22 59356 0.1211 0.4570 -0.25062 2021 5 23 59357 0.1229 0.4572 -0.25140 2021 5 24 59358 0.1248 0.4574 -0.25215 2021 5 25 59359 0.1266 0.4576 -0.25273 2021 5 26 59360 0.1284 0.4577 -0.25305 2021 5 27 59361 0.1303 0.4578 -0.25301 2021 5 28 59362 0.1322 0.4579 -0.25265 2021 5 29 59363 0.1340 0.4579 -0.25211 2021 5 30 59364 0.1359 0.4580 -0.25156 2021 5 31 59365 0.1377 0.4579 -0.25110 2021 6 1 59366 0.1396 0.4579 -0.25080 2021 6 2 59367 0.1414 0.4578 -0.25074 2021 6 3 59368 0.1433 0.4578 -0.25087 2021 6 4 59369 0.1452 0.4576 -0.25102 2021 6 5 59370 0.1470 0.4575 -0.25120 2021 6 6 59371 0.1489 0.4573 -0.25137 2021 6 7 59372 0.1507 0.4571 -0.25144 2021 6 8 59373 0.1526 0.4569 -0.25136 2021 6 9 59374 0.1544 0.4566 -0.25110 2021 6 10 59375 0.1563 0.4563 -0.25066 2021 6 11 59376 0.1581 0.4560 -0.25007 2021 6 12 59377 0.1599 0.4556 -0.24938 2021 6 13 59378 0.1618 0.4553 -0.24863 2021 6 14 59379 0.1636 0.4549 -0.24789 2021 6 15 59380 0.1654 0.4544 -0.24725 2021 6 16 59381 0.1672 0.4540 -0.24672 2021 6 17 59382 0.1690 0.4535 -0.24634 2021 6 18 59383 0.1708 0.4530 -0.24610 2021 6 19 59384 0.1725 0.4524 -0.24601 2021 6 20 59385 0.1743 0.4519 -0.24594 2021 6 21 59386 0.1761 0.4513 -0.24575 2021 6 22 59387 0.1778 0.4506 -0.24541 2021 6 23 59388 0.1796 0.4500 -0.24483 2021 6 24 59389 0.1813 0.4493 -0.24403 2021 6 25 59390 0.1830 0.4486 -0.24305 2021 6 26 59391 0.1847 0.4479 -0.24198 2021 6 27 59392 0.1864 0.4471 -0.24094 2021 6 28 59393 0.1880 0.4463 -0.24002 2021 6 29 59394 0.1897 0.4455 -0.23930 2021 6 30 59395 0.1913 0.4447 -0.23877 2021 7 1 59396 0.1930 0.4438 -0.23831 2021 7 2 59397 0.1946 0.4430 -0.23784 2021 7 3 59398 0.1962 0.4420 -0.23731 2021 7 4 59399 0.1978 0.4411 -0.23669 2021 7 5 59400 0.1993 0.4401 -0.23600 2021 7 6 59401 0.2009 0.4392 -0.23517 2021 7 7 59402 0.2024 0.4382 -0.23417 2021 7 8 59403 0.2039 0.4371 -0.23301 2021 7 9 59404 0.2054 0.4361 -0.23177 2021 7 10 59405 0.2069 0.4350 -0.23047 2021 7 11 59406 0.2083 0.4339 -0.22913 2021 7 12 59407 0.2097 0.4328 -0.22785 2021 7 13 59408 0.2111 0.4316 -0.22678 2021 7 14 59409 0.2125 0.4304 -0.22596 2021 7 15 59410 0.2139 0.4293 -0.22534 2021 7 16 59411 0.2152 0.4280 -0.22488 2021 7 17 59412 0.2165 0.4268 -0.22454 2021 7 18 59413 0.2178 0.4256 -0.22419 2021 7 19 59414 0.2191 0.4243 -0.22364 2021 7 20 59415 0.2204 0.4230 -0.22291 2021 7 21 59416 0.2216 0.4217 -0.22198 2021 7 22 59417 0.2228 0.4203 -0.22094 2021 7 23 59418 0.2240 0.4190 -0.21989 2021 7 24 59419 0.2251 0.4176 -0.21887 2021 7 25 59420 0.2262 0.4162 -0.21797 2021 7 26 59421 0.2273 0.4148 -0.21722 2021 7 27 59422 0.2284 0.4134 -0.21664 2021 7 28 59423 0.2294 0.4120 -0.21621 2021 7 29 59424 0.2304 0.4105 -0.21581 2021 7 30 59425 0.2314 0.4090 -0.21536 2021 7 31 59426 0.2324 0.4076 -0.21478 2021 8 1 59427 0.2333 0.4060 -0.21403 2021 8 2 59428 0.2342 0.4045 -0.21309 2021 8 3 59429 0.2351 0.4030 -0.21200 2021 8 4 59430 0.2360 0.4014 -0.21082 2021 8 5 59431 0.2368 0.3999 -0.20949 2021 8 6 59432 0.2376 0.3983 -0.20808 2021 8 7 59433 0.2383 0.3967 -0.20667 2021 8 8 59434 0.2391 0.3951 -0.20534 2021 8 9 59435 0.2398 0.3935 -0.20420 2021 8 10 59436 0.2404 0.3919 -0.20330 2021 8 11 59437 0.2411 0.3903 -0.20271 2021 8 12 59438 0.2417 0.3886 -0.20235 2021 8 13 59439 0.2422 0.3870 -0.20209 2021 8 14 59440 0.2428 0.3853 -0.20181 2021 8 15 59441 0.2433 0.3836 -0.20142 2021 8 16 59442 0.2438 0.3819 -0.20087 2021 8 17 59443 0.2442 0.3803 -0.20016 2021 8 18 59444 0.2447 0.3786 -0.19931 2021 8 19 59445 0.2450 0.3769 -0.19839 2021 8 20 59446 0.2454 0.3751 -0.19750 2021 8 21 59447 0.2457 0.3734 -0.19668 2021 8 22 59448 0.2460 0.3717 -0.19599 2021 8 23 59449 0.2463 0.3700 -0.19543 2021 8 24 59450 0.2465 0.3682 -0.19496 2021 8 25 59451 0.2467 0.3665 -0.19453 2021 8 26 59452 0.2468 0.3648 -0.19410 2021 8 27 59453 0.2470 0.3630 -0.19362 2021 8 28 59454 0.2471 0.3613 -0.19298 2021 8 29 59455 0.2471 0.3595 -0.19217 2021 8 30 59456 0.2471 0.3578 -0.19121 2021 8 31 59457 0.2471 0.3560 -0.19014 2021 9 1 59458 0.2471 0.3543 -0.18896 2021 9 2 59459 0.2470 0.3525 -0.18771 2021 9 3 59460 0.2469 0.3508 -0.18650 2021 9 4 59461 0.2468 0.3490 -0.18537 2021 9 5 59462 0.2466 0.3473 -0.18440 2021 9 6 59463 0.2464 0.3455 -0.18373 2021 9 7 59464 0.2461 0.3438 -0.18344 2021 9 8 59465 0.2459 0.3420 -0.18342 2021 9 9 59466 0.2456 0.3403 -0.18361 2021 9 10 59467 0.2452 0.3386 -0.18387 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) 59081 -116.80 0.26 -10.19 0.20 59082 -116.94 0.26 -10.06 0.20 59083 -117.31 0.26 -10.16 0.20 59084 -117.75 0.10 -10.35 0.10 59085 -118.07 0.10 -10.45 0.10 59086 -118.22 0.10 -10.40 0.10 IAU2000A Celestial Pole Offset Series MJD dX error dY error (msec. of arc) 59081 0.107 0.105 -0.175 0.198 59082 0.091 0.105 -0.167 0.198 59083 0.077 0.105 -0.157 0.198 59084 0.064 0.040 -0.145 0.102 59085 0.051 0.040 -0.132 0.102 59086 0.038 0.040 -0.119 0.102 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).