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Transit of Phobos from Mars

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851:, the "line integration time" is 80.4800 milliseconds, and the "downtrack summing" factor is 4. Since the shadow is centered at 6400 pixels from the bottom of the original 10800-pixel-high image (Mars Global Surveyor had a south-to-north Sun-synchronous orbit), we add (6400 × 0.08048 × 4) = 2060.3 seconds = 34 minutes 20.3 seconds to get a time of 04:00:33.3 UTC for the center of the shadow. Putting in the longitude/latitude/altitude coordinate values -310.8,10.9,0 into JPL Horizons we see that the predicted time of mid-transit was 04:00:36 25: 775: 763: 900:
principle the image could be as much as 43200 pixels high, but "downtrack summing" is used to merge adjacent lines. For instance, a downtrack summing factor of 27 causes every 27 lines to be merged into one, resulting in an image 1600 pixels high. Thus to determine the actual time that the Phobos shadow was imaged, it is necessary to locate the original image and measure how many pixels from the bottom of the image the shadow is found and add the corresponding offset to the image start time.
1038: 1028: 1214: 213:, transits of Phobos occur somewhere on Mars on most days of the Martian year. Its orbital inclination is 1.08°, so the latitude of its shadow projected onto the Martian surface shows a seasonal variation, moving from 70.4°S to 70.4°N and back again over the course of a Martian year. Phobos is so close to Mars that it is not visible south of 70.4°S or north of 70.4°N; for some days in the year, its shadow misses the surface entirely and falls north or south of Mars. 1035: 1025: 1218: 2427: 745: 699: 418:. There is some small discrepancy with the times reported for the series of images above. This may be due to imprecision in the ephemeris data used by JPL Horizons; also the JPL Horizons data gives local apparent solar time while the times reported above are probably some form of mean solar time (and therefore some of the discrepancy would be due to the Martian equivalent of the 2466: 2439: 911:, the line integration time is 80.48 milliseconds, and the downtrack summing factor is 27. The shadow is about 8 pixels high, centered at 993 pixels from the bottom of the original 1600-pixel-high image. We add (993 × 0.08048 × 27) = 2157.75 seconds = 35 minutes 57.75 seconds to get a time of 20:49:02.4 UTC for the center of the shadow. 159: 236:
Observers at high latitudes (but less than 70.4°) will see a noticeably smaller angular diameter for Phobos because they are considerably farther away from it than observers at Mars's equator. As a result, transits of Phobos for such observers will cover less of the Sun's disk. Because it orbits so
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At any given geographical location on the surface of Mars, there are two intervals in a Martian year when the shadow of Phobos or Deimos is passing through its latitude. During each such interval, about half a dozen transits of Phobos can be seen by observers at that geographical location (compared
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Stähler, S. C.; Widmer‐Schnidrig, R.; Scholz, J.‐R.; Driel, M.; Mittelholz, A.; Hurst, K.; Johnson, C. L.; Lemmon, M. T.; Lognonné, P.; Lorenz, R. D.; Müller, N. T.; Pou, L.; Spiga, A.; Banfield, D.; Ceylan, S.; Charalambous, C.; Clinton, J.; Giardini, D.; Nimmo, F.; Panning, M.; Zürn, W.; Banerdt,
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117.65 minutes, moving from south pole to north pole, and continuously points its camera straight down. The result is an image in the form of a very long thin vertical strip, where the pixels in the top part of the image are imaged nearly one hour after those in the bottom part of the image. In
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The timestamps printed on the photos in the NASA press release do not correspond to the actual time that the shadow was imaged, rather they represent the "image start time" of a vertically much larger original image. Mars Global Surveyor orbits Mars in a Sun-synchronous polar orbit with
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Transits of Phobos in 2019 were detected as a transient drop in the solar array current data of the InSight lander. At the time, the data were only acquired at 30s intervals, and so the events were only recorded as single-sample dips of a few to a few tens of per cent.
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For example, we examine the image labeled with the timestamp 1 September 1999 20:13:05 (UTC). We have the original images M07-00166 (red) and M07-00167 (blue), part of the gallery of MOC Global-Map Images, Subphase M07. The shadow is situated at roughly 14°N 236°W.
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Putting in the longitude/latitude/altitude coordinate values -124,14,0 into JPL Horizons gives an expected time of 20:49 for the transit, which is in good agreement once again. On 1 September 1999 the distance between the Earth and Mars was 9.9 light-minutes.
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and a 2 K drop in surface temperature. The tilt of the seismometer was caused from contraction of the ground due to the temperature drop; everywhere but in the shadow the thermal shielding around the seismometer.
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Lorenz, Ralph D.; Lemmon, Mark T.; Maki, Justin; Banfield, Donald; Spiga, Aymeric; Charalambous, Constantinos; Barrett, Elizabeth; Herman, Jennifer A.; White, Brett T.; Pasco, Samuel; Banerdt, W. Bruce (2020).
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We can also look up the original image files at M04-03241 (red) and M04-03242 (blue), part of the gallery of MOC Wide-Angle Images, Region Lunae Palus, Subphase M04. The "image start time" was 03:26:13.01
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and its high-resolution Mars Orbital Camera. One such image was taken on 26 August 1999 and shows the shadow at high resolution. This image was featured in a 1 November 1999 NASA press release.
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Lander and Orbiter photographed the shadow as well. The Lander detected the penumbral shadow of Phobos passing across it. This was detected only as a slight dimming of the ambient light; the
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During the transits of spring 2020, all instruments onboard InSight recorded with full sampling rate and a slight tilt of the ultra-sensitive seismometer was observed, as well as a drop in
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Many dozens of other images of the shadow exist, but these are much lower resolution (by a factor of 27/4). Three such images are shown in the 1 November 1999 NASA press release.
680: 656: 855:, in perfect agreement within the error of determining the exact longitude and latitude of the center of the shadow. This was about 14:41 Martian local solar time, and the 162: 805:
Lander camera did not image the Sun. The shadow took about 20 seconds to pass over the Lander, moving at about 2 km/s. The shadow was simultaneously imaged from the
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The colors are distorted to enhance the visibility of the shadow. The blue and white horizontal stripes correspond to test chart patches on the spacecraft.
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shadow of Phobos can be seen to move rapidly over the Martian surface. This shadow on the Martian surface has been photographed on many occasions by
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passes directly between the Sun and a point on the surface of Mars, obscuring a large part of the Sun's disc for an observer on Mars. During a
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close to Mars, Phobos cannot be seen north of 70.4°N or south of 70.4°S; observers at such latitudes will obviously not see transits, either.
1896: 1881: 247:(MER-B) had photographed some transits of Phobos on 7, 10 and 12 March 2004. In the captions as seen below, the first row shows Earth time 1612: 1074: 1056: 46: 2110: 1697: 221:). Transits of Phobos happen during Martian autumn and winter in the respective hemisphere; close to the equator they happen around the 698: 2355: 2350: 1979: 68: 1632: 139:, Phobos can be seen from Mars as a large black disc rapidly moving across the face of the Sun. At the same time, the shadow ( 2486: 1672: 1509: 1466: 756:
Lander detects Phobos' shadow. The brownish stripes in the middle represent the martian surface visible above the spacecraft.
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A transit of Phobos from Mars usually lasts only thirty seconds or so, due to the moon's very rapid
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Orbiter, which permitted locating the position of the lander in the orbiter pictures.
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Far more detailed images of the shadow were taken with the arrival in 1997 of the
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By examining maps of Mars we see the shadow is centered at around 10.9°N 49.2°W.
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on 26 August 1999. The center of the shadow was at 10.9°N 49.2°W at 04:00:33
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Orbiter images Phobos' shadow a few kilometers directly north of the
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The event could also be regarded as a particularly quick and shallow
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prior set of transits occurred in late April 2003 – early May 2003
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next set of transits occurred in the second half of March 2005
441: 248: 124: 105: 18: 1388:(must use telnet interface for non-Earth observation points) 883:. The center of the shadow was at 14°N 236°W at 20:49:02.4 229:, while farther from the equator they happen closer to the 1091:"MOC Wide-Angle Images, Region Lunae Palus, Subphase M04" 209:
Because Phobos orbits close to Mars and in line with its
1294:"Geophysical Observations of Phobos Transits by InSight" 1444: 825:
shadow of Phobos on the Martian landscape, as seen by
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Bell, M. Lemmon, M. Wolff, 1072:MOC wide-angle image M04-03242 1054:MOC wide-angle image M04-03241 1: 1348:, IAU Circ., 8298, 2 (2004). 206:of approximately 7.6 hours. 1882:Recurring slope lineae (RSL) 1298:Geophysical Research Letters 991:SP-425 The Martian Landscape 967:Transit of Mercury from Mars 389: 330: 283: 2316:Inspiration Mars Foundation 957:Transit of Deimos from Mars 251:, and the second row shows 16:Transit of a Moon from Mars 2508: 2351:Artificial objects on Mars 962:Transit of Earth from Mars 636:rover on the planet Mars. 80: 2420: 2368:List of films set on Mars 2183:C/2013 A1 (Siding Spring) 1980:Classical albedo features 1482: 1346:Transits of Mars I and II 1292:W. B. (16 October 2020). 2286:List of missions to Mars 351:12 March 2004 transit – 299:10 March 2004 transit – 253:Martian local solar time 2444:Solar System portal 1246:Earth and Space Science 721:Viewed from orbit, the 259:7 March 2004 transit – 53:more precise citations. 2058:Solar eclipses on Mars 1917:"Swiss cheese" feature 1773:Concentric crater fill 952:Solar eclipses on Mars 888: 833: 593:(12:30:00 – 12:30:28) 571:(13:41:02 – 13:41:38) 549:(14:47:15 – 14:47:53) 527:(07:36:33 – 07:37:07) 505:(01:39:58 – 01:40:31) 483:(02:46:25 – 02:46:54) 199: 116: 83:Solar eclipses on Mars 2487:Astronomical transits 1427:image gallery: Sol 47 1411:image gallery: Sol 45 1395:image gallery: Sol 42 870: 820: 169: 148:annular solar eclipse 99: 2258:Permanent settlement 1310:10.1029/2020GL089099 1259:10.1029/2019EA000992 1252:(5): e2019EA000992. 881:Mars Global Surveyor 838:Mars Global Surveyor 827:Mars Global Surveyor 813:26 August 1999 image 727:Mars Global Surveyor 717:Images of the shadow 596:13 57 16 – 13 57 42 574:15 44 38 – 15 45 13 552:17 27 19 – 17 27 56 530:11 06 16 – 11 06 49 508:06 35 36 – 06 36 08 486:08 18 32 – 08 19 00 187:, larger of the two 2400:Timekeeping on Mars 2077:Planetary transits 2062:Satellite transits 1975:Observation history 1823:Lobate debris apron 1319:20.500.11850/444382 449:(Local Solar time) 434: 357: 305: 265: 227:September equinoxes 108:, as viewed by the 1432:2012-07-16 at the 1416:2012-07-16 at the 1400:2012-07-16 at the 1127:NASA press release 1077:2007-03-11 at the 1059:2007-03-11 at the 1041:2005-12-15 at the 1031:2005-12-15 at the 1015:NASA press release 919:Other observations 889: 834: 795:In the 1970s, the 709:(October 28, 2023) 692:(February 8, 2024) 671:(January 19, 2024) 425: 350: 298: 258: 219:transits of Deimos 200: 198:, 20 August 2013). 117: 2452: 2451: 2405:Sol (day on Mars) 2373:Martian scientist 2356:Memorials on Mars 2339: 2338: 2310:The Case for Mars 2207: 2206: 1988: 1987: 1922:Terrain softening 1887:Ring mold craters 1855:North Polar Basin 1778:Dark slope streak 1623:Vastitas Borealis 1520:Dust devil tracks 1125:November 1, 1999 942:Astronomy on Mars 929:solar irradiation 690:Transit of Phobos 685: 661: 632:as viewed by the 619: 618: 412: 411: 348: 347: 296: 295: 167: 131:takes place when 121:transit of Phobos 97: 79: 78: 71: 2499: 2469: 2468: 2467: 2460: 2442: 2441: 2440: 2429: 2428: 2303:The Mars Project 2218: 2166: 2156: 2146: 2124: 2122: 2121: 1999: 1860:Ocean hypothesis 1710:Outflow channels 1498: 1469: 1462: 1455: 1446: 1377: 1332: 1331: 1321: 1288: 1282: 1281: 1271: 1261: 1236: 1230: 1229: 1227: 1226: 1217:. 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1737: 1731: 1728: 1726: 1723: 1721: 1718: 1716: 1713: 1711: 1708: 1706: 1703: 1699: 1696: 1695: 1694: 1691: 1689: 1686: 1684: 1681: 1679: 1676: 1674: 1671: 1669: 1666: 1664: 1663:Chaos terrain 1661: 1659: 1656: 1654: 1651: 1648: 1644: 1641: 1640: 1638: 1636: 1630: 1624: 1621: 1619: 1616: 1614: 1611: 1609: 1606: 1604: 1601: 1599: 1596: 1594: 1591: 1589: 1586: 1584: 1581: 1579: 1578:Planum Boreum 1576: 1574: 1571: 1569: 1568:Olympia Undae 1566: 1564: 1561: 1559: 1558:Eridania Lake 1556: 1554: 1551: 1549: 1546: 1544: 1541: 1540: 1538: 1536: 1532: 1526: 1523: 1521: 1518: 1516: 1513: 1511: 1508: 1507: 1505: 1503: 1499: 1496: 1494: 1490: 1486: 1481: 1477: 1470: 1465: 1463: 1458: 1456: 1451: 1450: 1447: 1441: 1438: 1435: 1431: 1428: 1426: 1422: 1419: 1415: 1412: 1410: 1406: 1403: 1399: 1396: 1394: 1390: 1387: 1384: 1382: 1378: 1375: 1369: 1368: 1364: 1359: 1356: 1352: 1351: 1347: 1343: 1342: 1338: 1329: 1325: 1320: 1315: 1311: 1307: 1303: 1299: 1295: 1287: 1284: 1279: 1275: 1270: 1265: 1260: 1255: 1251: 1247: 1243: 1235: 1232: 1221:on 2018-06-14 1220: 1216: 1210: 1207: 1196:on 2011-09-26 1195: 1191: 1185: 1182: 1171:on 2011-09-26 1170: 1166: 1160: 1157: 1146:on 2011-09-26 1145: 1141: 1135: 1132: 1128: 1122: 1119: 1116: 1111: 1108: 1097:on 2011-09-26 1096: 1092: 1086: 1083: 1080: 1076: 1073: 1068: 1065: 1062: 1058: 1055: 1050: 1047: 1044: 1040: 1037: 1034: 1030: 1027: 1022: 1019: 1016: 1011: 1008: 996: 992: 988: 987:"Beyond Mars" 982: 979: 972: 968: 965: 963: 960: 958: 955: 953: 950: 948: 945: 943: 940: 939: 935: 933: 930: 925: 918: 916: 912: 910: 905: 901: 898: 892: 886: 882: 878: 874: 869: 862: 860: 858: 854: 850: 844: 841: 839: 832: 828: 824: 819: 812: 810: 808: 804: 800: 799: 787: 783: 776: 764: 755: 754: 746: 735: 732: 730: 728: 724: 716: 707: 700: 669: 645: 637: 635: 631: 627: 623: 615: 611: 607: 604: 601: 598: 595: 591:13 March 2004 590: 589: 585: 582: 579: 576: 573: 569:12 March 2004 568: 567: 563: 560: 557: 554: 551: 547:11 March 2004 546: 545: 541: 538: 535: 532: 529: 525:10 March 2004 524: 523: 519: 516: 513: 510: 507: 502: 501: 497: 494: 491: 488: 485: 480: 479: 476: 472: 466: 461: 456: 451: 446: 443: 437: 436: 433:landing site 432: 430: 423: 421: 417: 405: 400: 395: 390: 385: 381: 378: 374: 371: 367: 364: 360: 359: 356: 355: 341: 336: 331: 326: 322: 319: 315: 312: 308: 307: 304: 303: 289: 284: 279: 275: 272: 268: 267: 264: 263: 256: 254: 250: 246: 244: 238: 234: 232: 228: 224: 220: 214: 212: 207: 205: 197: 195: 190: 189:moons of Mars 186: 182: 180: 175: 174: 170:Video (01:30/ 153: 151: 149: 144: 142: 138: 134: 130: 127:as seen from 126: 122: 114: 112: 107: 103: 84: 73: 70: 62: 52: 48: 42: 41: 35: 30: 21: 20: 2471:Solar System 2390:Life on Mars 2385:Flag of Mars 2326:Mars Society 2308: 2301: 2268:Terraforming 2263:Colonization 2065: 2033:Swift crater 1875:polar wander 1603:Terra Sabaea 1543:Arabia Terra 1424: 1408: 1392: 1386:JPL Horizons 1373: 1349: 1345: 1301: 1297: 1286: 1249: 1245: 1234: 1223:. Retrieved 1219:the original 1209: 1198:. Retrieved 1194:the original 1184: 1173:. Retrieved 1169:the original 1159: 1148:. Retrieved 1144:the original 1134: 1121: 1110: 1099:. Retrieved 1095:the original 1085: 1067: 1049: 1021: 1010: 998:. Retrieved 990: 981: 926: 922: 913: 906: 902: 893: 890: 863:Other images 845: 842: 835: 806: 802: 796: 794: 785: 781: 751: 733: 720: 644:Perseverance 643: 634:Perseverance 633: 621: 620: 613: 503:8 March 2004 481:7 March 2004 474: 440:Earth time ( 428: 416:JPL Horizons 413: 353: 301: 261: 242: 239: 235: 215: 208: 201: 193: 178: 171: 145: 120: 118: 111:Perseverance 110: 65: 56: 37: 2213:Exploration 2135:5261 Eureka 1803:Groundwater 1768:Composition 1593:Tempe Terra 1583:Quadrangles 1510:Circulation 1425:Opportunity 1409:Opportunity 1393:Opportunity 1026:Map of area 704:Transit of 666:Transit of 464:ang. diam. 459:ang. diam. 429:Opportunity 354:Opportunity 302:Opportunity 262:Opportunity 243:Opportunity 240:Mars Rover 150:by Phobos. 123:across the 59:August 2012 51:introducing 2481:Categories 1870:Polar caps 1850:Mud cracks 1833:Meteorites 1818:Lava tubes 1753:Carbonates 1688:Labyrinthi 1563:Iani Chaos 1502:Atmosphere 1225:2007-05-29 1200:2007-05-29 1175:2007-05-29 1150:2007-05-29 1115:Page Moved 1101:2007-05-29 1000:27 January 973:References 875:shadow of 181:of the Sun 34:references 2395:Sub-Earth 2378:Mythology 2331:Mars race 2098:Asteroids 1994:Astronomy 1965:Hesperian 1960:Amazonian 1932:Volcanism 1907:Spherules 1828:Marsquake 1783:Dichotomy 1698:by height 1693:Mountains 1493:Geography 1374:Curiosity 1328:225482160 873:penumbral 823:penumbral 723:penumbral 408:15:43:04 403:15:42:54 398:15:42:44 393:15:42:35 344:11:04:42 339:11:04:32 334:11:04:23 292:08:16:51 287:08:16:41 194:Curiosity 173:real-time 2431:Category 2295:Advocacy 2278:Missions 2221:Concepts 2050:Transits 2021:Monolith 1970:Noachian 1942:Yardangs 1838:on Earth 1798:Glaciers 1643:"Canals" 1635:features 1633:Physical 1430:Archived 1414:Archived 1398:Archived 1278:32715027 1075:Archived 1057:Archived 1039:Archived 1036:Map zoom 1029:Archived 936:See also 807:Viking 1 803:Viking 1 798:Viking 1 786:Viking 1 782:Viking 1 753:Viking 1 734:Viking 1 605:1224.6" 583:1225.5" 561:1226.3" 539:1227.6" 517:1229.8" 495:1230.7" 447:Duration 438:Duration 406:13:41:17 401:13:41:07 396:13:40:57 391:13:40:47 342:07:36:48 337:07:36:38 332:07:36:28 290:02:46:33 285:02:46:23 141:antumbra 102:transits 2363:Fiction 2344:Related 2238:Landing 2233:Orbiter 2192:General 2161:2007 NS 2151:1999 UJ 2141:1998 VF 2130:Trojans 2117:2007 WD 2106:Impacts 2086:Mercury 1952:History 1912:Surface 1843:on Mars 1808:Gullies 1793:Geysers 1740:Geology 1730:Gravity 1725:Valleys 1678:Gullies 1668:Craters 1658:Catenae 1653:Canyons 1608:Tharsis 1553:Cydonia 1535:Regions 1525:Methane 1515:Climate 1381:YouTube 1269:7375148 788:Lander. 706:Mercury 630:Mercury 602:880.4" 580:784.5" 558:669.4" 536:908.4" 514:665.0" 492:779.2" 454:separ. 211:equator 179:Eclipse 154:Transit 137:transit 100:Phobos 47:improve 2457:Portal 2435:  2424:  2176:Comets 2071:Deimos 2066:Phobos 2028:Deimos 2011:Phobos 1715:Plains 1683:Mensae 1673:Fossae 1326:  1304:(19). 1276:  1266:  877:Phobos 668:Deimos 626:Deimos 608:60.4° 586:33.7° 542:76.3° 498:34.6° 457:Phobos 452:Minim. 185:Phobos 133:Phobos 36:, but 2243:Rover 2228:Flyby 2199:Orbit 2081:Earth 2003:Moons 1937:Water 1813:Lakes 1763:Color 1613:Undae 1376:Rover 1324:S2CID 1215:"map" 646:rover 599:625" 564:8.0° 555:193" 533:114" 520:8.9° 511:517" 489:671" 469:alt. 431:rover 245:rover 223:March 196:rover 113:rover 1902:Soil 1647:list 1476:Mars 1274:PMID 1002:2009 995:NASA 871:The 821:The 780:The 577:64" 225:and 129:Mars 104:the 1379:on 1355:TeX 1314:hdl 1306:doi 1264:PMC 1254:doi 909:UTC 885:UTC 857:Sun 853:UTC 849:UTC 831:UTC 467:Sun 462:Sun 442:UTC 422:). 249:UTC 183:by 176:): 125:Sun 106:Sun 2483:: 2143:31 1360:). 1322:. 1312:. 1302:47 1300:. 1296:. 1272:. 1262:. 1248:. 1244:. 993:. 989:. 729:. 444:) 255:. 233:. 119:A 2459:: 2163:2 2153:7 2120:5 1649:) 1645:( 1468:e 1461:t 1454:v 1353:( 1330:. 1316:: 1308:: 1280:. 1256:: 1250:7 1228:. 1203:. 1178:. 1153:. 1129:. 1104:. 1004:. 191:( 72:) 66:( 61:) 57:( 43:.

Index

references
inline citations
improve
introducing
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Solar eclipses on Mars
transits
Sun
Perseverance rover
Sun
Mars
Phobos
transit
antumbra
annular solar eclipse
real-time
Eclipse of the Sun
Phobos
moons of Mars
Curiosity rover
orbital period
equator
transits of Deimos
March
September equinoxes
winter solstice
Opportunity rover
UTC
Martian local solar time
Opportunity

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