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Celestial equator

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20: 525: 549: 501: 537: 513: 122:. The celestial equator is defined to be infinitely distant (since it is on the celestial sphere); thus, the ends of the semicircle always intersect the horizon due east and due west, regardless of the observer's position on Earth. At the 130:, the celestial equator is a uniform arc or circle because the observer is only finitely far from the plane of the celestial equator, but infinitely far from the celestial equator itself. 261:
Over thousands of years, the orientation of Earth's equator and thus the constellations the celestial equator passes through will change due to
569: 579: 574: 379: 468: 118:, the point directly overhead. As the observer moves north (or south), the celestial equator tilts towards the opposite 295: 76: 589: 491: 371: 339: 191: 140:(reach the meridian) highest near the equator. The celestial equator currently passes through these 248: 172: 100: 316: 472: 243: 167: 152: 220: 201: 177: 423:"New model of Mars surface irradiation for the climate simulation chamber 'Artificial Mars'" 352: 434: 348: 156: 80: 8: 553: 469:"Equal length of day and night on Saturn: the start of spring in the northern hemisphere" 211: 133: 438: 136:
near the celestial equator appear above the horizon from most places on earth, but they
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Celestial bodies other than Earth also have similarly defined celestial equators.
91:, the celestial equator is currently inclined by about 23.44° with respect to the 181: 285: 446: 563: 141: 40: 420: 337:
Berger, A.L. (1976). "Obliquity and Precession for the Last 5000000 Years".
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Tarasashvili MV, Sabashvili ShA, Tsereteli SL, Aleksidze NG (26 Mar 2013).
52: 290: 196: 137: 84: 60: 126:, the celestial equator coincides with the astronomical horizon. At all 111: 88: 28: 232: 19: 127: 92: 36: 24: 23:
The celestial equator is currently inclined by about 23.44° to the
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The Amateur Astronomer's Introduction to the Celestial Sphere
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plane. The image shows the relations between Earth's
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These are the most globally visible constellations.
561: 16:Projection of Earth's equator out into space 18: 562: 365: 336: 110:visualizes the celestial equator as a 427:International Journal of Astrobiology 223:(contains the first point of Libra) 13: 14: 601: 547: 535: 523: 511: 499: 394: 106:An observer standing on Earth's 83:of the terrestrial equator into 570:Astronomical coordinate systems 580:Technical factors of astrology 461: 414: 388: 359: 330: 309: 1: 302: 71:. By extension, it is also a 575:Dynamics of the Solar System 296:Rotation around a fixed axis 146: 77:equatorial coordinate system 7: 397:"Map of the Constellations" 274: 10: 606: 372:Cambridge University Press 340:Astronomy and Astrophysics 159:above its southern border) 148: 447:10.1017/S1473550413000062 217: 188: 149: 366:Millar, William (2006). 473:German Aerospace Center 353:1976A&A....51..127B 44: 22: 157:first point of Aries 134:Astronomical objects 114:passing through the 103:from other planets. 439:2013IJAsB..12..161T 317:"Celestial Equator" 73:plane of reference 45: 590:Planes (geometry) 381:978-0-521-67123-1 256: 255: 87:. Due to Earth's 55:of the imaginary 49:celestial equator 597: 552: 551: 550: 540: 539: 538: 528: 527: 526: 516: 515: 504: 503: 502: 495: 484: 483: 481: 479: 465: 459: 458: 418: 412: 411: 409: 407: 392: 386: 385: 363: 357: 356: 334: 328: 327: 325: 323: 313: 281:Axial precession 263:axial precession 147: 57:celestial sphere 605: 604: 600: 599: 598: 596: 595: 594: 560: 559: 558: 548: 546: 536: 534: 524: 522: 510: 500: 498: 490: 488: 487: 477: 475: 467: 466: 462: 419: 415: 405: 403: 395:Ford, Dominic. 393: 389: 382: 364: 360: 335: 331: 321: 319: 315: 314: 310: 305: 277: 271: 17: 12: 11: 5: 603: 593: 592: 587: 582: 577: 572: 557: 556: 544: 532: 520: 508: 486: 485: 460: 433:(2): 161–170. 413: 401:in-the-sky.org 387: 380: 358: 347:(1): 127–135. 329: 307: 306: 304: 301: 300: 299: 293: 288: 286:Celestial pole 283: 276: 273: 254: 253: 252: 251: 246: 241: 235: 230: 224: 216: 215: 214: 209: 204: 199: 194: 187: 186: 185: 175: 170: 165: 160: 155:(contains the 142:constellations 95:(the plane of 15: 9: 6: 4: 3: 2: 602: 591: 588: 586: 583: 581: 578: 576: 573: 571: 568: 567: 565: 555: 545: 543: 533: 531: 521: 519: 514: 509: 507: 497: 496: 493: 474: 470: 464: 456: 452: 448: 444: 440: 436: 432: 428: 424: 417: 402: 398: 391: 383: 377: 373: 369: 362: 354: 350: 346: 342: 341: 333: 318: 312: 308: 297: 294: 292: 289: 287: 284: 282: 279: 278: 272: 269: 266: 264: 259: 250: 247: 245: 242: 239: 236: 234: 231: 228: 225: 222: 219: 218: 213: 210: 208: 205: 203: 200: 198: 195: 193: 190: 189: 183: 179: 176: 174: 171: 169: 166: 164: 161: 158: 154: 151: 150: 145: 143: 139: 135: 131: 129: 125: 121: 117: 113: 109: 104: 102: 98: 97:Earth's orbit 94: 90: 86: 82: 78: 74: 70: 66: 62: 58: 54: 50: 42: 41:orbital plane 38: 37:rotation axis 34: 30: 26: 21: 554:Solar System 476:. Retrieved 463: 430: 426: 416: 404:. Retrieved 400: 390: 367: 361: 344: 338: 332: 320:. Retrieved 311: 270: 267: 260: 257: 182:Orion's belt 132: 105: 101:perturbation 53:great circle 48: 46: 32: 542:Outer space 530:Spaceflight 291:Declination 197:Canis Minor 85:outer space 564:Categories 303:References 112:semicircle 89:axial tilt 81:projection 61:same plane 29:axial tilt 506:Astronomy 455:120041831 233:Ophiuchus 192:Monoceros 138:culminate 128:latitudes 33:obliquity 322:5 August 275:See also 249:Aquarius 173:Eridanus 93:ecliptic 25:ecliptic 585:Circles 492:Portals 435:Bibcode 349:Bibcode 240:(cauda) 238:Serpens 229:(caput) 227:Serpens 207:Sextans 120:horizon 108:equator 75:in the 65:equator 63:as the 59:on the 51:is the 453:  378:  298:(pole) 244:Aquila 180:(near 168:Taurus 153:Pisces 116:zenith 39:, and 518:Stars 478:1 Feb 451:S2CID 406:1 Feb 221:Virgo 202:Hydra 178:Orion 163:Cetus 124:poles 69:Earth 480:2021 408:2021 376:ISBN 324:2011 47:The 31:(or 443:doi 212:Leo 67:of 35:), 566:: 471:. 449:. 441:. 431:12 429:. 425:. 399:. 374:. 370:. 345:51 343:. 265:. 144:: 494:: 482:. 457:. 445:: 437:: 410:. 384:. 355:. 351:: 326:. 184:) 43:.

Index


ecliptic
axial tilt
rotation axis
orbital plane
great circle
celestial sphere
same plane
equator
Earth
plane of reference
equatorial coordinate system
projection
outer space
axial tilt
ecliptic
Earth's orbit
perturbation
equator
semicircle
zenith
horizon
poles
latitudes
Astronomical objects
culminate
constellations
Pisces
first point of Aries
Cetus

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