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Sidereal year

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and is also supposed to align with the spring equinox and have relevance to the harvesting and planting season and thus the tropical year. However, as the entry into the constellation occurs 25 days later, according to the astronomical calculation of the sidereal year, this date marks the
178:, the difference between sidereal and tropical year was unknown to the Greeks. For naked-eye observation, the shift of the constellations relative to the equinoxes only becomes apparent over centuries or " 118:
Hence, for Earth, it is also the time taken for the Sun to return to the same position relative to Earth with respect to the fixed stars after apparently travelling once around the
1450: 1373: 192:
would give the times of the year for sowing, harvest, and so on by reference to the first visibility of stars, effectively using the sidereal year. The
1366: 2224: 1904: 206: 2239: 1359: 936: 772: 401: 1873: 1624: 2131: 886: 541: 356: 200:, as are the calendars of neighbouring countries, is traditionally reckoned by the Sun's entry into the sign of 1697: 765: 1878: 141: 848: 148:, "the period of time required for the ecliptic longitude of the Sun to increase 360 degrees", due to the 1833: 1813: 1759: 1644: 1480: 1139: 2122: 1500: 1485: 1423: 1402: 491: 471: 1654: 1465: 1202: 1051: 931: 481: 394: 218: 2234: 901: 193: 1914: 1692: 1594: 1510: 1505: 1157: 808: 228: 2229: 511: 2067: 1340: 972: 917: 871: 856: 501: 152:. The sidereal year is 20 min 24.5 s longer than the mean tropical year at J2000.0 104: 1894: 1808: 1634: 1495: 1223: 1192: 641: 536: 387: 8: 2196: 2104: 1899: 1754: 1619: 1571: 1097: 556: 516: 1440: 2184: 2172: 2079: 1853: 1777: 1707: 1046: 1024: 891: 715: 686: 621: 614: 364: 175: 367:. International Earth rotation and Reference systems Service (IERS). February 13, 2014 1927: 1792: 1609: 1127: 1006: 906: 759: 662: 566: 201: 2148: 2072: 1818: 1797: 1749: 1712: 1525: 1245: 1233: 1061: 1029: 861: 730: 646: 636: 551: 179: 160: 149: 69: 63: 28: 322: 1803: 1782: 1614: 1586: 1351: 1307: 1172: 1149: 1117: 1069: 1056: 1019: 1001: 631: 626: 304: 238: 2208: 2136: 2099: 1858: 1848: 1787: 1744: 1576: 1566: 1535: 1435: 1407: 1250: 1240: 1039: 911: 881: 866: 651: 609: 604: 476: 248: 233: 188: 84: 2218: 1986: 1937: 1922: 1868: 1639: 1475: 1470: 1386: 1330: 1280: 1228: 1162: 1134: 1122: 1112: 1102: 984: 828: 754: 703: 656: 571: 531: 526: 521: 454: 253: 243: 223: 164: 136: 18:
Time taken by the Earth to orbit the Sun once with respect to the fixed stars
90: 2160: 2084: 1971: 1966: 1961: 1948: 1687: 1302: 1296: 962: 896: 818: 749: 698: 599: 546: 486: 197: 2094: 2089: 1734: 1717: 1649: 1629: 1515: 1397: 1312: 1290: 1197: 1182: 977: 957: 947: 876: 833: 813: 742: 561: 463: 163:
corresponds to a period of 25,772 years, so sidereal year is longer than
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by 1,224.5 seconds (20 min 24.5 s, ~365.24219*86400/25772).
2016: 2001: 1991: 1445: 1382: 424: 410: 170:
Before the discovery of the precession of the equinoxes by
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International Earth Rotation and Reference Systems Service
1996: 108: 75: 379: 2120: 72: 31: 40: 37: 1381: 276: 274: 2216: 359:, HM Nautical Almanac Office. 2016. p. M19. 271: 1367: 395: 286: 49: 1374: 1360: 402: 388: 144:epoch. The sidereal year differs from the 1905:International Commission on Stratigraphy 207:South and Southeast Asian solar New Year 95: 'asterism, star'), also called a 2217: 353:Astronomical Almanac for the Year 2017 1355: 383: 320: 1336: 363: 321:Stern, David P. (October 10, 2016). 280: 182:", and pre-modern calendars such as 327:NASA's Polar, Wind and Geotail Site 13: 350: 292: 14: 2251: 1625:Discrete time and continuous time 209:in other countries and cultures 2202: 2190: 2178: 2166: 2154: 2142: 2130: 1550: 1544: 1335: 1326: 1325: 355:. Washington, D.C., and London: 154:(365.242 190 402 ephemeris days) 68: 27: 2225:Astronomical coordinate systems 357:United States Naval Observatory 2240:Technical factors of astrology 1698:History of timekeeping devices 344: 314: 298: 1: 7: 1645:Gravitational time dilation 1481:Barycentric Coordinate Time 1140:Geological history of Earth 212: 150:precession of the equinoxes 10: 2256: 1501:Geocentric Coordinate Time 1486:Barycentric Dynamical Time 1424:Coordinated Universal Time 492:Orders of magnitude (time) 2055: 1946: 1913: 1887: 1768: 1668: 1655:Time-translation symmetry 1585: 1559: 1542: 1466:International Atomic Time 1416: 1393: 1321: 1263: 1216: 1203:Time translation symmetry 1148: 1088: 1078: 1000: 927: 847: 788: 672: 590: 500: 462: 448: 417: 111:once with respect to the 409: 264: 196:, based on the works of 194:Indian national calendar 159:At present, the rate of 1915:Astronomical chronology 1888:Archaeology and geology 1595:Absolute space and time 1511:IERS Reference Meridian 1506:International Date Line 1417:International standards 1158:Absolute space and time 809:Astronomical chronology 229:Julian year (astronomy) 97:sidereal orbital period 1208:Time reversal symmetry 512:Italian six-hour clock 311:, p. 581 expression 39 239:Precession § Astronomy 89: 1874:Weekday determination 1760:Sundial markup schema 973:Time and fate deities 918:The Unreality of Time 857:A series and B series 1895:Chronological dating 1635:Theory of relativity 1496:Daylight saving time 1224:Chronological dating 1193:Theory of relativity 537:Daylight saving time 2105:Time value of money 1900:Geologic time scale 1755:History of sundials 1620:Cosmological decade 1572:Greenwich Mean Time 1403:Orders of magnitude 517:Thai six-hour clock 107:takes to orbit the 99:, is the time that 2080:Mental chronometry 1708:Marine chronometer 1560:Obsolete standards 1047:Rosy retrospection 1025:Mental chronometry 849:Philosophy of time 365:"Useful Constants" 176:Hellenistic period 2118: 2117: 1928:Nuclear timescale 1610:Continuous signal 1349: 1348: 1259: 1258: 1234:Circadian rhythms 1052:Tense–aspect–mood 907:Temporal finitism 784: 783: 760:Grandfather clock 2247: 2207: 2206: 2195: 2194: 2193: 2183: 2182: 2181: 2171: 2170: 2169: 2159: 2158: 2147: 2146: 2145: 2135: 2134: 2126: 1819:Dominical letter 1750:Equation of time 1713:Marine sandglass 1554: 1548: 1526:Terrestrial Time 1383:Time measurement 1376: 1369: 1362: 1353: 1352: 1339: 1338: 1329: 1328: 1246:Glottochronology 1086: 1085: 1002:Human experience 862:B-theory of time 460: 459: 404: 397: 390: 381: 380: 376: 374: 372: 360: 338: 337: 335: 333: 318: 312: 302: 296: 290: 284: 278: 219:Anomalistic year 161:axial precession 155: 139: 135: 134: 131: 82: 81: 78: 77: 74: 67: 59: 58: 55: 54: 51: 48: 45: 42: 39: 36: 33: 2255: 2254: 2250: 2249: 2248: 2246: 2245: 2244: 2235:Hindu astrology 2215: 2214: 2213: 2201: 2191: 2189: 2179: 2177: 2167: 2165: 2153: 2143: 2141: 2129: 2121: 2119: 2114: 2051: 1942: 1909: 1883: 1764: 1664: 1615:Coordinate time 1587:Time in physics 1581: 1555: 1549: 1540: 1412: 1389: 1380: 1350: 1345: 1317: 1308:Time immemorial 1255: 1212: 1173:Coordinate time 1144: 1098:Geological time 1074: 1057:Time management 1020:Generation time 1004: 996: 941: 923: 843: 802: 780: 668: 586: 503: 496: 452: 444: 413: 408: 370: 368: 347: 342: 341: 331: 329: 319: 315: 303: 299: 291: 287: 279: 272: 267: 215: 153: 132: 129: 127: 126: 71: 62: 61: 30: 26: 19: 12: 11: 5: 2253: 2243: 2242: 2237: 2232: 2227: 2212: 2211: 2199: 2187: 2175: 2163: 2151: 2139: 2116: 2115: 2113: 2112: 2107: 2102: 2100:Time metrology 2097: 2092: 2087: 2082: 2077: 2076: 2075: 2065: 2059: 2057: 2056:Related topics 2053: 2052: 2050: 2049: 2044: 2039: 2034: 2029: 2024: 2019: 2014: 2009: 2004: 1999: 1994: 1989: 1984: 1979: 1974: 1969: 1964: 1959: 1953: 1951: 1944: 1943: 1941: 1940: 1935: 1930: 1925: 1919: 1917: 1911: 1910: 1908: 1907: 1902: 1897: 1891: 1889: 1885: 1884: 1882: 1881: 1876: 1871: 1866: 1861: 1856: 1851: 1846: 1841: 1836: 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1931: 1929: 1926: 1924: 1923:Galactic year 1921: 1920: 1918: 1916: 1912: 1906: 1903: 1901: 1898: 1896: 1893: 1892: 1890: 1886: 1880: 1879:Weekday names 1877: 1875: 1872: 1870: 1869:Tropical year 1867: 1865: 1862: 1860: 1857: 1855: 1852: 1850: 1847: 1845: 1842: 1840: 1837: 1835: 1834:Intercalation 1832: 1830: 1827: 1825: 1822: 1820: 1817: 1815: 1812: 1810: 1807: 1805: 1802: 1800:(lunar Hijri) 1799: 1796: 1794: 1791: 1789: 1786: 1784: 1781: 1779: 1776: 1775: 1773: 1771: 1767: 1761: 1758: 1756: 1753: 1751: 1748: 1746: 1743: 1741: 1738: 1736: 1733: 1729: 1726: 1725: 1724: 1721: 1719: 1716: 1714: 1711: 1709: 1706: 1704: 1701: 1699: 1696: 1694: 1691: 1689: 1686: 1684: 1681: 1679: 1676: 1675: 1673: 1671: 1667: 1661: 1658: 1656: 1653: 1651: 1648: 1646: 1643: 1641: 1640:Time dilation 1638: 1636: 1633: 1631: 1628: 1626: 1623: 1621: 1618: 1616: 1613: 1611: 1608: 1606: 1603: 1601: 1598: 1596: 1593: 1592: 1590: 1588: 1584: 1578: 1575: 1573: 1570: 1568: 1565: 1564: 1562: 1558: 1553: 1547: 1537: 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1104: 1101: 1100: 1099: 1096: 1095: 1093: 1091: 1087: 1084: 1082: 1077: 1071: 1067: 1063: 1060: 1058: 1055: 1053: 1050: 1048: 1045: 1041: 1038: 1036: 1033: 1032: 1031: 1028: 1026: 1023: 1021: 1018: 1016: 1013: 1012: 1010: 1008: 1003: 999: 991: 988: 987: 986: 985:Wheel of time 983: 979: 976: 975: 974: 971: 969: 966: 964: 961: 959: 956: 954: 951: 949: 946: 945: 943: 938: 935: 933: 930: 929: 926: 920: 919: 915: 913: 910: 908: 905: 903: 900: 898: 895: 893: 890: 888: 885: 883: 880: 878: 875: 873: 870: 868: 865: 863: 860: 858: 855: 854: 852: 850: 846: 840: 837: 835: 832: 830: 829:Periodization 827: 825: 822: 820: 817: 815: 812: 810: 807: 806: 804: 799: 796: 794: 791: 790: 787: 775: 774: 770: 769: 768: 767: 763: 761: 758: 756: 755:Digital clock 753: 751: 748: 744: 741: 737: 734: 732: 729: 728: 727: 724: 722: 719: 717: 714: 712: 709: 705: 702: 701: 700: 697: 693: 690: 689: 688: 685: 684: 683: 680: 679: 677: 675: 671: 665: 664: 660: 658: 655: 653: 650: 648: 645: 643: 640: 638: 635: 633: 630: 628: 625: 623: 620: 616: 613: 611: 608: 606: 603: 602: 601: 598: 597: 595: 593: 589: 583: 580: 578: 575: 573: 570: 568: 565: 563: 560: 558: 555: 553: 550: 548: 545: 543: 540: 538: 535: 533: 532:Relative hour 530: 528: 527:24-hour clock 525: 523: 522:12-hour clock 520: 518: 515: 513: 510: 509: 507: 505: 499: 493: 490: 488: 485: 483: 480: 478: 475: 473: 470: 469: 467: 465: 461: 458: 456: 451: 447: 441: 438: 436: 433: 431: 428: 426: 423: 422: 420: 416: 412: 405: 400: 398: 393: 391: 386: 385: 382: 366: 362: 358: 354: 349: 348: 328: 324: 317: 310: 308: 305:N. Capitaine 301: 294: 289: 282: 277: 275: 270: 260: 257: 255: 254:Tropical year 252: 250: 247: 245: 244:Sidereal time 242: 240: 237: 235: 232: 230: 227: 225: 224:Gaussian year 222: 220: 217: 216: 210: 208: 203: 199: 198:Maga Brahmins 195: 191: 190: 185: 181: 177: 173: 168: 166: 165:tropical year 162: 157: 151: 147: 143: 138: 123: 121: 116: 114: 110: 106: 102: 98: 94: 93: 92: 86: 80: 65: 57: 24: 23:sidereal year 16: 2197:Solar System 2085:Decimal time 1814:Astronomical 1693:Complication 1688:Atomic clock 1303:Time capsule 1297:Tempus fugit 1295: 1217:Other fields 916: 897:Perdurantism 819:Calendar era 771: 764: 750:Cuckoo clock 687:astronomical 661: 487:Unit of time 418:Key concepts 371:February 29, 369:. Retrieved 352: 351:"Glossary". 330:. Retrieved 326: 323:"Precession" 316: 306: 300: 288: 187: 169: 158: 124: 117: 96: 88: 22: 20: 15: 2185:Outer space 2173:Spaceflight 2095:System time 2090:Metric time 1809:Solar Hijri 1735:Water clock 1718:Radio clock 1650:Time domain 1630:Proper time 1516:Leap second 1398:Chronometry 1313:Time travel 1291:System time 1198:Time domain 1183:Proper time 1007:use of time 978:Father Time 958:Immortality 948:Ages of Man 877:Endurantism 834:Regnal year 814:Big History 743:water-based 642:Solar Hijri 552:Hexadecimal 502:Measurement 464:Chronometry 450:Measurement 345:Works cited 113:fixed stars 103:or another 83:; from 2219:Categories 2110:Timekeeper 2063:Chronology 2047:Millennium 1933:Precession 1839:Julian day 1660:T-symmetry 1521:Solar time 1491:Civil time 1015:Chronemics 990:Kalachakra 902:Presentism 887:Eternalism 793:Chronology 731:mechanical 682:Main types 600:Main types 172:Hipparchus 146:solar year 125:It equals 2149:Astronomy 2007:Fortnight 1854:Lunisolar 1844:Leap year 1778:Gregorian 1728:stopwatch 1703:Hourglass 1683:Astrarium 1600:Spacetime 1531:Time zone 1408:Metrology 1387:standards 1271:Leap year 1188:Spacetime 1062:Yesterday 963:Dreamtime 937:Mythology 824:Deep time 736:stopwatch 711:hourglass 692:astrarium 622:Gregorian 615:Lunisolar 592:Calendars 582:Time zone 455:standards 332:April 25, 281:IERS 2014 259:Mars time 2068:Duration 2042:Saeculum 2022:Olympiad 1864:Solstice 1793:Holocene 1770:Calendar 1670:Horology 1461:ISO 8601 1456:ISO 31-1 1331:Category 1079:Time in 1070:Tomorrow 932:Religion 872:Duration 839:Timeline 773:Timeline 572:Sidereal 440:Eternity 213:See also 140:for the 120:ecliptic 2209:Science 2137:Physics 2123:Portals 2037:Century 2027:Lustrum 1957:Instant 1829:Equinox 1798:Islamic 1740:Sundial 1605:Chronon 1341:Commons 1264:Related 1178:Instant 1168:Chronon 1150:Physics 1090:Geology 1081:science 953:Destiny 798:History 766:History 721:sundial 704:quantum 647:Chinese 637:Islamic 547:Decimal 542:Chinese 504:systems 430:Present 293:AA 2016 174:in the 142:J2000.0 128:365.256 2032:Decade 1987:Moment 1982:Minute 1977:Second 1947:Other 1804:Julian 1783:Hebrew 1429:offset 1281:Moment 1276:Memory 1128:period 716:marine 699:atomic 674:Clocks 632:Hebrew 627:Julian 562:Metric 435:Future 307:et al. 184:Hesiod 2161:Stars 2073:music 2012:Month 1972:Jiffy 1967:Shake 1962:Flick 1859:Solar 1849:Lunar 1824:Epact 1788:Hindu 1723:Watch 1678:Clock 1286:Space 1118:epoch 1108:chron 1066:Today 1035:tempo 1030:Music 892:Event 726:watch 610:Lunar 605:Solar 577:Solar 567:Roman 557:Hindu 265:Notes 202:Aries 101:Earth 91:sidus 87: 85:Latin 66:also 2017:Year 2002:Week 1992:Hour 1446:DUT1 1385:and 1005:and 968:Kāla 663:List 657:Maya 453:and 425:Past 411:Time 373:2020 334:2022 309:2003 180:ages 1997:Day 1123:era 1113:eon 1103:age 482:TAI 472:UTC 186:'s 133:004 130:363 109:Sun 44:ɪər 2221:: 1441:ΔT 1436:UT 1068:– 1064:– 477:UT 325:. 273:^ 156:. 122:. 115:. 79:-/ 64:US 60:, 53:əl 35:aɪ 21:A 2125:: 1375:e 1368:t 1361:v 403:e 396:t 389:v 375:. 336:. 295:. 283:. 76:ɪ 73:s 70:/ 56:/ 50:. 47:i 41:d 38:ˈ 32:s 29:/ 25:(

Index

/sˈdɪəri.əl/
US
/sɪ-/
Latin
sidus
Earth
planetary body
Sun
fixed stars
ecliptic
ephemeris days
J2000.0
solar year
precession of the equinoxes
axial precession
tropical year
Hipparchus
Hellenistic period
ages
Hesiod
Works and Days
Indian national calendar
Maga Brahmins
Aries
South and Southeast Asian solar New Year
Anomalistic year
Gaussian year
Julian year (astronomy)
Orbital period
Precession § Astronomy

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