********************************************************************** * * * I E R S B U L L E T I N - A * * * * Rapid Service/Prediction of Earth Orientation * ********************************************************************** 8 October 2020 Vol. XXXIII No. 041 ______________________________________________________________________ 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 10 2 59124 0.19253 .00009 0.32371 .00009 -0.173257 0.000016 20 10 3 59125 0.19138 .00009 0.32280 .00009 -0.173092 0.000018 20 10 4 59126 0.19047 .00009 0.32156 .00009 -0.172955 0.000022 20 10 5 59127 0.18998 .00009 0.32022 .00009 -0.172785 0.000020 20 10 6 59128 0.18942 .00009 0.31924 .00009 -0.172529 0.000020 20 10 7 59129 0.18842 .00009 0.31848 .00009 -0.172169 0.000022 20 10 8 59130 0.18714 .00009 0.31757 .00009 -0.171697 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 = 0.1162 + 0.0609 cos A - 0.0516 sin A + 0.0117 cos C + 0.0030 sin C y = 0.3602 - 0.0490 cos A - 0.0568 sin A + 0.0030 cos C - 0.0117 sin C UT1-UTC = -0.1773 - 0.00004 (MJD - 59138) - (UT2-UT1) where A = 2*pi*(MJD-59130)/365.25 and C = 2*pi*(MJD-59130)/435. TAI-UTC(MJD 59131) = 37.0 The accuracy may be estimated from the expressions: S x,y = 0.00068 (MJD-59130)**0.80 S t = 0.00025 (MJD-59130)**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 10 9 59131 0.1859 0.3166 -0.17111 2020 10 10 59132 0.1846 0.3155 -0.17048 2020 10 11 59133 0.1834 0.3144 -0.16989 2020 10 12 59134 0.1824 0.3132 -0.16945 2020 10 13 59135 0.1815 0.3120 -0.16925 2020 10 14 59136 0.1806 0.3110 -0.16936 2020 10 15 59137 0.1796 0.3101 -0.16977 2020 10 16 59138 0.1786 0.3093 -0.17039 2020 10 17 59139 0.1775 0.3084 -0.17105 2020 10 18 59140 0.1764 0.3075 -0.17157 2020 10 19 59141 0.1753 0.3066 -0.17184 2020 10 20 59142 0.1742 0.3057 -0.17184 2020 10 21 59143 0.1731 0.3049 -0.17162 2020 10 22 59144 0.1720 0.3040 -0.17126 2020 10 23 59145 0.1709 0.3033 -0.17083 2020 10 24 59146 0.1698 0.3025 -0.17041 2020 10 25 59147 0.1686 0.3017 -0.17007 2020 10 26 59148 0.1675 0.3010 -0.16986 2020 10 27 59149 0.1663 0.3002 -0.16981 2020 10 28 59150 0.1651 0.2995 -0.16990 2020 10 29 59151 0.1639 0.2988 -0.17007 2020 10 30 59152 0.1627 0.2982 -0.17028 2020 10 31 59153 0.1614 0.2976 -0.17045 2020 11 1 59154 0.1602 0.2969 -0.17056 2020 11 2 59155 0.1589 0.2963 -0.17056 2020 11 3 59156 0.1577 0.2957 -0.17043 2020 11 4 59157 0.1564 0.2952 -0.17017 2020 11 5 59158 0.1551 0.2947 -0.16980 2020 11 6 59159 0.1538 0.2941 -0.16936 2020 11 7 59160 0.1524 0.2936 -0.16894 2020 11 8 59161 0.1511 0.2932 -0.16861 2020 11 9 59162 0.1498 0.2927 -0.16844 2020 11 10 59163 0.1484 0.2923 -0.16851 2020 11 11 59164 0.1470 0.2919 -0.16885 2020 11 12 59165 0.1456 0.2915 -0.16942 2020 11 13 59166 0.1443 0.2911 -0.17013 2020 11 14 59167 0.1429 0.2908 -0.17081 2020 11 15 59168 0.1415 0.2905 -0.17133 2020 11 16 59169 0.1400 0.2902 -0.17159 2020 11 17 59170 0.1386 0.2899 -0.17160 2020 11 18 59171 0.1372 0.2897 -0.17141 2020 11 19 59172 0.1358 0.2895 -0.17113 2020 11 20 59173 0.1343 0.2893 -0.17087 2020 11 21 59174 0.1329 0.2891 -0.17070 2020 11 22 59175 0.1314 0.2889 -0.17065 2020 11 23 59176 0.1300 0.2888 -0.17074 2020 11 24 59177 0.1285 0.2887 -0.17093 2020 11 25 59178 0.1270 0.2886 -0.17118 2020 11 26 59179 0.1256 0.2885 -0.17145 2020 11 27 59180 0.1241 0.2885 -0.17168 2020 11 28 59181 0.1226 0.2885 -0.17184 2020 11 29 59182 0.1211 0.2885 -0.17187 2020 11 30 59183 0.1197 0.2885 -0.17177 2020 12 1 59184 0.1182 0.2886 -0.17152 2020 12 2 59185 0.1167 0.2887 -0.17114 2020 12 3 59186 0.1152 0.2888 -0.17068 2020 12 4 59187 0.1137 0.2889 -0.17021 2020 12 5 59188 0.1123 0.2891 -0.16982 2020 12 6 59189 0.1108 0.2893 -0.16956 2020 12 7 59190 0.1093 0.2895 -0.16951 2020 12 8 59191 0.1078 0.2897 -0.16969 2020 12 9 59192 0.1064 0.2899 -0.17009 2020 12 10 59193 0.1049 0.2902 -0.17064 2020 12 11 59194 0.1034 0.2905 -0.17122 2020 12 12 59195 0.1020 0.2908 -0.17171 2020 12 13 59196 0.1005 0.2912 -0.17198 2020 12 14 59197 0.0991 0.2916 -0.17200 2020 12 15 59198 0.0976 0.2920 -0.17179 2020 12 16 59199 0.0962 0.2924 -0.17144 2020 12 17 59200 0.0948 0.2928 -0.17105 2020 12 18 59201 0.0933 0.2933 -0.17071 2020 12 19 59202 0.0919 0.2938 -0.17048 2020 12 20 59203 0.0905 0.2943 -0.17037 2020 12 21 59204 0.0891 0.2948 -0.17038 2020 12 22 59205 0.0877 0.2954 -0.17047 2020 12 23 59206 0.0864 0.2959 -0.17060 2020 12 24 59207 0.0850 0.2966 -0.17071 2020 12 25 59208 0.0836 0.2972 -0.17077 2020 12 26 59209 0.0823 0.2978 -0.17074 2020 12 27 59210 0.0809 0.2985 -0.17059 2020 12 28 59211 0.0796 0.2992 -0.17031 2020 12 29 59212 0.0783 0.2999 -0.16992 2020 12 30 59213 0.0770 0.3006 -0.16945 2020 12 31 59214 0.0757 0.3014 -0.16899 2021 1 1 59215 0.0744 0.3022 -0.16858 2021 1 2 59216 0.0732 0.3030 -0.16833 2021 1 3 59217 0.0719 0.3038 -0.16828 2021 1 4 59218 0.0707 0.3046 -0.16846 2021 1 5 59219 0.0695 0.3055 -0.16885 2021 1 6 59220 0.0683 0.3064 -0.16939 2021 1 7 59221 0.0671 0.3073 -0.16999 2021 1 8 59222 0.0659 0.3082 -0.17052 2021 1 9 59223 0.0648 0.3091 -0.17090 2021 1 10 59224 0.0636 0.3101 -0.17106 2021 1 11 59225 0.0625 0.3111 -0.17099 2021 1 12 59226 0.0614 0.3120 -0.17077 2021 1 13 59227 0.0603 0.3131 -0.17049 2021 1 14 59228 0.0593 0.3141 -0.17023 2021 1 15 59229 0.0582 0.3151 -0.17009 2021 1 16 59230 0.0572 0.3162 -0.17008 2021 1 17 59231 0.0562 0.3173 -0.17020 2021 1 18 59232 0.0552 0.3184 -0.17043 2021 1 19 59233 0.0543 0.3195 -0.17071 2021 1 20 59234 0.0533 0.3207 -0.17100 2021 1 21 59235 0.0524 0.3218 -0.17123 2021 1 22 59236 0.0515 0.3230 -0.17138 2021 1 23 59237 0.0507 0.3242 -0.17141 2021 1 24 59238 0.0498 0.3253 -0.17131 2021 1 25 59239 0.0490 0.3266 -0.17098 2021 1 26 59240 0.0482 0.3278 -0.17056 2021 1 27 59241 0.0474 0.3290 -0.17011 2021 1 28 59242 0.0466 0.3303 -0.16972 2021 1 29 59243 0.0459 0.3315 -0.16945 2021 1 30 59244 0.0452 0.3328 -0.16940 2021 1 31 59245 0.0445 0.3341 -0.16959 2021 2 1 59246 0.0438 0.3354 -0.17001 2021 2 2 59247 0.0432 0.3367 -0.17060 2021 2 3 59248 0.0426 0.3381 -0.17125 2021 2 4 59249 0.0420 0.3394 -0.17184 2021 2 5 59250 0.0414 0.3407 -0.17229 2021 2 6 59251 0.0409 0.3421 -0.17254 2021 2 7 59252 0.0404 0.3435 -0.17257 2021 2 8 59253 0.0399 0.3448 -0.17245 2021 2 9 59254 0.0395 0.3462 -0.17224 2021 2 10 59255 0.0390 0.3476 -0.17206 2021 2 11 59256 0.0386 0.3490 -0.17199 2021 2 12 59257 0.0382 0.3504 -0.17207 2021 2 13 59258 0.0379 0.3518 -0.17230 2021 2 14 59259 0.0376 0.3533 -0.17267 2021 2 15 59260 0.0373 0.3547 -0.17312 2021 2 16 59261 0.0370 0.3561 -0.17359 2021 2 17 59262 0.0368 0.3576 -0.17403 2021 2 18 59263 0.0366 0.3590 -0.17440 2021 2 19 59264 0.0364 0.3605 -0.17465 2021 2 20 59265 0.0362 0.3619 -0.17477 2021 2 21 59266 0.0361 0.3634 -0.17477 2021 2 22 59267 0.0360 0.3648 -0.17468 2021 2 23 59268 0.0359 0.3663 -0.17455 2021 2 24 59269 0.0359 0.3678 -0.17445 2021 2 25 59270 0.0359 0.3692 -0.17445 2021 2 26 59271 0.0359 0.3707 -0.17466 2021 2 27 59272 0.0359 0.3722 -0.17513 2021 2 28 59273 0.0360 0.3737 -0.17587 2021 3 1 59274 0.0361 0.3751 -0.17683 2021 3 2 59275 0.0362 0.3766 -0.17789 2021 3 3 59276 0.0364 0.3781 -0.17893 2021 3 4 59277 0.0366 0.3795 -0.17982 2021 3 5 59278 0.0368 0.3810 -0.18048 2021 3 6 59279 0.0370 0.3825 -0.18091 2021 3 7 59280 0.0373 0.3839 -0.18114 2021 3 8 59281 0.0376 0.3854 -0.18127 2021 3 9 59282 0.0380 0.3869 -0.18140 2021 3 10 59283 0.0383 0.3883 -0.18160 2021 3 11 59284 0.0387 0.3898 -0.18194 2021 3 12 59285 0.0391 0.3912 -0.18244 2021 3 13 59286 0.0396 0.3926 -0.18308 2021 3 14 59287 0.0400 0.3941 -0.18383 2021 3 15 59288 0.0405 0.3955 -0.18462 2021 3 16 59289 0.0411 0.3969 -0.18540 2021 3 17 59290 0.0416 0.3983 -0.18611 2021 3 18 59291 0.0422 0.3997 -0.18670 2021 3 19 59292 0.0428 0.4011 -0.18715 2021 3 20 59293 0.0435 0.4025 -0.18746 2021 3 21 59294 0.0441 0.4039 -0.18766 2021 3 22 59295 0.0448 0.4053 -0.18779 2021 3 23 59296 0.0456 0.4066 -0.18791 2021 3 24 59297 0.0463 0.4080 -0.18810 2021 3 25 59298 0.0471 0.4093 -0.18845 2021 3 26 59299 0.0479 0.4107 -0.18904 2021 3 27 59300 0.0487 0.4120 -0.18991 2021 3 28 59301 0.0496 0.4133 -0.19105 2021 3 29 59302 0.0505 0.4146 -0.19236 2021 3 30 59303 0.0514 0.4159 -0.19370 2021 3 31 59304 0.0523 0.4171 -0.19492 2021 4 1 59305 0.0533 0.4184 -0.19591 2021 4 2 59306 0.0543 0.4196 -0.19661 2021 4 3 59307 0.0553 0.4209 -0.19707 2021 4 4 59308 0.0563 0.4221 -0.19737 2021 4 5 59309 0.0574 0.4233 -0.19760 2021 4 6 59310 0.0584 0.4245 -0.19787 2021 4 7 59311 0.0596 0.4256 -0.19824 2021 4 8 59312 0.0607 0.4268 -0.19873 2021 4 9 59313 0.0618 0.4279 -0.19935 2021 4 10 59314 0.0630 0.4290 -0.20006 2021 4 11 59315 0.0642 0.4301 -0.20081 2021 4 12 59316 0.0654 0.4312 -0.20155 2021 4 13 59317 0.0667 0.4323 -0.20223 2021 4 14 59318 0.0679 0.4333 -0.20280 2021 4 15 59319 0.0692 0.4344 -0.20323 2021 4 16 59320 0.0705 0.4354 -0.20355 2021 4 17 59321 0.0719 0.4364 -0.20375 2021 4 18 59322 0.0732 0.4373 -0.20389 2021 4 19 59323 0.0746 0.4383 -0.20401 2021 4 20 59324 0.0760 0.4392 -0.20416 2021 4 21 59325 0.0774 0.4401 -0.20441 2021 4 22 59326 0.0788 0.4410 -0.20482 2021 4 23 59327 0.0803 0.4419 -0.20545 2021 4 24 59328 0.0817 0.4427 -0.20633 2021 4 25 59329 0.0832 0.4436 -0.20742 2021 4 26 59330 0.0847 0.4444 -0.20862 2021 4 27 59331 0.0862 0.4451 -0.20978 2021 4 28 59332 0.0877 0.4459 -0.21077 2021 4 29 59333 0.0893 0.4466 -0.21149 2021 4 30 59334 0.0908 0.4473 -0.21195 2021 5 1 59335 0.0924 0.4480 -0.21218 2021 5 2 59336 0.0940 0.4487 -0.21229 2021 5 3 59337 0.0956 0.4493 -0.21236 2021 5 4 59338 0.0972 0.4499 -0.21246 2021 5 5 59339 0.0989 0.4505 -0.21262 2021 5 6 59340 0.1005 0.4511 -0.21285 2021 5 7 59341 0.1022 0.4517 -0.21312 2021 5 8 59342 0.1038 0.4522 -0.21340 2021 5 9 59343 0.1055 0.4527 -0.21366 2021 5 10 59344 0.1072 0.4531 -0.21386 2021 5 11 59345 0.1089 0.4536 -0.21395 2021 5 12 59346 0.1106 0.4540 -0.21391 2021 5 13 59347 0.1123 0.4544 -0.21374 2021 5 14 59348 0.1141 0.4547 -0.21346 2021 5 15 59349 0.1158 0.4551 -0.21312 2021 5 16 59350 0.1176 0.4554 -0.21275 2021 5 17 59351 0.1193 0.4557 -0.21243 2021 5 18 59352 0.1211 0.4559 -0.21220 2021 5 19 59353 0.1228 0.4562 -0.21212 2021 5 20 59354 0.1246 0.4564 -0.21225 2021 5 21 59355 0.1264 0.4565 -0.21264 2021 5 22 59356 0.1282 0.4567 -0.21325 2021 5 23 59357 0.1300 0.4568 -0.21407 2021 5 24 59358 0.1318 0.4569 -0.21497 2021 5 25 59359 0.1336 0.4570 -0.21571 2021 5 26 59360 0.1354 0.4570 -0.21622 2021 5 27 59361 0.1372 0.4570 -0.21648 2021 5 28 59362 0.1390 0.4570 -0.21653 2021 5 29 59363 0.1408 0.4570 -0.21639 2021 5 30 59364 0.1426 0.4569 -0.21618 2021 5 31 59365 0.1444 0.4568 -0.21603 2021 6 1 59366 0.1462 0.4567 -0.21594 2021 6 2 59367 0.1480 0.4565 -0.21597 2021 6 3 59368 0.1498 0.4564 -0.21608 2021 6 4 59369 0.1516 0.4562 -0.21622 2021 6 5 59370 0.1534 0.4559 -0.21634 2021 6 6 59371 0.1552 0.4557 -0.21639 2021 6 7 59372 0.1570 0.4554 -0.21636 2021 6 8 59373 0.1588 0.4551 -0.21621 2021 6 9 59374 0.1605 0.4547 -0.21594 2021 6 10 59375 0.1623 0.4543 -0.21550 2021 6 11 59376 0.1641 0.4539 -0.21482 2021 6 12 59377 0.1659 0.4535 -0.21394 2021 6 13 59378 0.1676 0.4531 -0.21299 2021 6 14 59379 0.1694 0.4526 -0.21205 2021 6 15 59380 0.1711 0.4521 -0.21120 2021 6 16 59381 0.1729 0.4515 -0.21052 2021 6 17 59382 0.1746 0.4510 -0.21004 2021 6 18 59383 0.1763 0.4504 -0.20974 2021 6 19 59384 0.1780 0.4498 -0.20966 2021 6 20 59385 0.1797 0.4491 -0.20972 2021 6 21 59386 0.1814 0.4485 -0.20979 2021 6 22 59387 0.1831 0.4478 -0.20969 2021 6 23 59388 0.1847 0.4471 -0.20933 2021 6 24 59389 0.1864 0.4463 -0.20868 2021 6 25 59390 0.1880 0.4456 -0.20785 2021 6 26 59391 0.1897 0.4448 -0.20700 2021 6 27 59392 0.1913 0.4439 -0.20623 2021 6 28 59393 0.1929 0.4431 -0.20559 2021 6 29 59394 0.1945 0.4422 -0.20511 2021 6 30 59395 0.1960 0.4413 -0.20480 2021 7 1 59396 0.1976 0.4404 -0.20459 2021 7 2 59397 0.1991 0.4395 -0.20445 2021 7 3 59398 0.2006 0.4385 -0.20432 2021 7 4 59399 0.2021 0.4375 -0.20418 2021 7 5 59400 0.2036 0.4365 -0.20396 2021 7 6 59401 0.2051 0.4355 -0.20359 2021 7 7 59402 0.2066 0.4344 -0.20307 2021 7 8 59403 0.2080 0.4333 -0.20241 2021 7 9 59404 0.2094 0.4322 -0.20164 2021 7 10 59405 0.2108 0.4311 -0.20086 2021 7 11 59406 0.2122 0.4300 -0.20014 2021 7 12 59407 0.2135 0.4288 -0.19958 2021 7 13 59408 0.2148 0.4276 -0.19920 2021 7 14 59409 0.2161 0.4264 -0.19901 2021 7 15 59410 0.2174 0.4252 -0.19896 2021 7 16 59411 0.2187 0.4239 -0.19901 2021 7 17 59412 0.2199 0.4226 -0.19899 2021 7 18 59413 0.2212 0.4214 -0.19888 2021 7 19 59414 0.2224 0.4201 -0.19858 2021 7 20 59415 0.2235 0.4187 -0.19804 2021 7 21 59416 0.2247 0.4174 -0.19724 2021 7 22 59417 0.2258 0.4160 -0.19619 2021 7 23 59418 0.2269 0.4146 -0.19498 2021 7 24 59419 0.2280 0.4132 -0.19379 2021 7 25 59420 0.2290 0.4118 -0.19274 2021 7 26 59421 0.2300 0.4104 -0.19189 2021 7 27 59422 0.2310 0.4089 -0.19125 2021 7 28 59423 0.2320 0.4075 -0.19086 2021 7 29 59424 0.2330 0.4060 -0.19061 2021 7 30 59425 0.2339 0.4045 -0.19032 2021 7 31 59426 0.2348 0.4030 -0.18999 2021 8 1 59427 0.2356 0.4015 -0.18959 2021 8 2 59428 0.2364 0.3999 -0.18905 2021 8 3 59429 0.2373 0.3984 -0.18836 2021 8 4 59430 0.2380 0.3968 -0.18753 2021 8 5 59431 0.2388 0.3953 -0.18660 2021 8 6 59432 0.2395 0.3937 -0.18562 2021 8 7 59433 0.2402 0.3921 -0.18467 2021 8 8 59434 0.2408 0.3905 -0.18379 2021 8 9 59435 0.2415 0.3888 -0.18308 2021 8 10 59436 0.2421 0.3872 -0.18258 2021 8 11 59437 0.2426 0.3856 -0.18226 2021 8 12 59438 0.2432 0.3839 -0.18208 2021 8 13 59439 0.2437 0.3823 -0.18194 2021 8 14 59440 0.2442 0.3806 -0.18178 2021 8 15 59441 0.2446 0.3789 -0.18147 2021 8 16 59442 0.2450 0.3773 -0.18090 2021 8 17 59443 0.2454 0.3756 -0.18013 2021 8 18 59444 0.2458 0.3739 -0.17921 2021 8 19 59445 0.2461 0.3722 -0.17821 2021 8 20 59446 0.2464 0.3705 -0.17722 2021 8 21 59447 0.2466 0.3688 -0.17632 2021 8 22 59448 0.2468 0.3670 -0.17561 2021 8 23 59449 0.2470 0.3653 -0.17508 2021 8 24 59450 0.2472 0.3636 -0.17478 2021 8 25 59451 0.2473 0.3619 -0.17464 2021 8 26 59452 0.2474 0.3602 -0.17452 2021 8 27 59453 0.2475 0.3584 -0.17433 2021 8 28 59454 0.2475 0.3567 -0.17402 2021 8 29 59455 0.2475 0.3550 -0.17360 2021 8 30 59456 0.2475 0.3532 -0.17308 2021 8 31 59457 0.2474 0.3515 -0.17244 2021 9 1 59458 0.2473 0.3498 -0.17170 2021 9 2 59459 0.2472 0.3480 -0.17088 2021 9 3 59460 0.2470 0.3463 -0.17010 2021 9 4 59461 0.2468 0.3446 -0.16940 2021 9 5 59462 0.2466 0.3429 -0.16879 2021 9 6 59463 0.2464 0.3411 -0.16837 2021 9 7 59464 0.2461 0.3394 -0.16825 2021 9 8 59465 0.2457 0.3377 -0.16841 2021 9 9 59466 0.2454 0.3360 -0.16870 2021 9 10 59467 0.2450 0.3343 -0.16904 2021 9 11 59468 0.2446 0.3326 -0.16932 2021 9 12 59469 0.2441 0.3309 -0.16940 2021 9 13 59470 0.2436 0.3292 -0.16918 2021 9 14 59471 0.2431 0.3275 -0.16878 2021 9 15 59472 0.2426 0.3258 -0.16827 2021 9 16 59473 0.2420 0.3242 -0.16782 2021 9 17 59474 0.2414 0.3225 -0.16754 2021 9 18 59475 0.2407 0.3209 -0.16743 2021 9 19 59476 0.2401 0.3192 -0.16750 2021 9 20 59477 0.2393 0.3176 -0.16775 2021 9 21 59478 0.2386 0.3160 -0.16813 2021 9 22 59479 0.2378 0.3144 -0.16860 2021 9 23 59480 0.2370 0.3128 -0.16904 2021 9 24 59481 0.2362 0.3112 -0.16935 2021 9 25 59482 0.2354 0.3096 -0.16947 2021 9 26 59483 0.2345 0.3081 -0.16939 2021 9 27 59484 0.2335 0.3065 -0.16911 2021 9 28 59485 0.2326 0.3050 -0.16871 2021 9 29 59486 0.2316 0.3035 -0.16827 2021 9 30 59487 0.2306 0.3020 -0.16778 2021 10 1 59488 0.2296 0.3005 -0.16731 2021 10 2 59489 0.2285 0.2990 -0.16695 2021 10 3 59490 0.2274 0.2975 -0.16676 2021 10 4 59491 0.2263 0.2961 -0.16684 2021 10 5 59492 0.2252 0.2947 -0.16721 2021 10 6 59493 0.2240 0.2933 -0.16785 2021 10 7 59494 0.2228 0.2919 -0.16862 2021 10 8 59495 0.2216 0.2905 -0.16934 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) 59111 -117.52 0.12 -9.39 0.13 59112 -117.78 0.12 -9.69 0.13 59113 -117.88 0.12 -9.83 0.13 59114 -117.86 0.32 -9.74 0.16 IAU2000A Celestial Pole Offset Series MJD dX error dY error (msec. of arc) 59111 0.035 0.048 -0.076 0.126 59112 0.035 0.048 -0.076 0.126 59113 0.035 0.048 -0.076 0.126 59114 0.035 0.128 -0.076 0.160 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).