100:
3133:
3035:
769:
554:
3097:
3121:
3073:
3061:
3109:
3085:
61:
took place at the beginning of
January 1 at midnight, and the current moment maps onto the end of December 31 just before midnight. At this scale, there are 437.5 years per cosmic second, 1.575 million years per cosmic hour, and 37.8 million years per cosmic day.
81:. Sagan goes on to extend the comparison in terms of surface area, explaining that if the Cosmic Calendar were scaled to the size of a football field, then "all of human history would occupy an area the size of hand".
1485:
Ohtomo, Yoko; Kakegawa, Takeshi; Ishida, Akizumi; Nagase, Toshiro; Rosing, Minik T. (8 December 2013). "Evidence for biogenic graphite in early
Archaean Isua metasedimentary rocks".
2956:
2665:
1695:
2280:
1956:
1210:
2961:
1555:"Microbially Induced Sedimentary Structures Recording an Ancient Ecosystem in the ca. 3.48 Billion-Year-Old Dresser Formation, Pilbara, Western Australia"
532:
401:
2659:
492:
2998:
2777:
461:
2834:
2745:
2631:
2584:
1727:
1290:
1294:
2074:
2275:
1871:
816:
601:
103:
A graphical view of the Cosmic
Calendar, featuring the months of the year, days of December, the final minute, and the final second
1911:
1205:
790:
575:
696:
99:
794:
579:
397:
2321:
2069:
1384:
1189:
207:
3051:
2869:
2064:
1226:
3158:
2842:
2254:
2124:
1253:
1241:
1236:
1231:
1221:
1200:
138:
779:
564:
3163:
2464:
2444:
1247:
1215:
709:
35:
1374:
798:
783:
583:
568:
2946:
2826:
2637:
2454:
2426:
2038:
925:
77:
2697:
2577:
2521:
1720:
1348:
435:
2409:
1663:
2850:
2761:
2617:
2459:
2196:
2043:
963:
313:
3153:
2359:
2160:
1906:
1805:
1618:
1559:
917:
342:
2877:
2769:
2729:
2689:
2654:
2627:
1961:
1145:
2394:
2977:
2753:
2335:
2311:
2306:
1568:
1496:
1424:
1137:
1038:
748:
414:
3125:
3038:
3004:
2911:
2721:
2705:
2570:
2421:
2316:
2259:
2234:
2224:
1999:
1896:
1886:
1713:
1409:
1379:
1001:
856:
722:
85:
71:
39:
3113:
3101:
3020:
2546:
2526:
2404:
2389:
2374:
2296:
2095:
2059:
1861:
220:
1298:
2982:
2354:
2150:
2145:
1989:
1825:
1645:
1594:
1487:
1460:
1442:
1195:
1178:
1104:
1071:
1030:
959:
904:
268:
93:
47:
3077:
2951:
2713:
2551:
2500:
2416:
2364:
2140:
2118:
1984:
1881:
1635:
1627:
1584:
1576:
1504:
1450:
1432:
1388:
1268:
1112:
921:
896:
383:
179:
166:
2399:
1523:
1332:
1318:
2987:
2796:
2484:
2449:
2436:
2346:
2099:
2033:
1994:
1831:
984:
976:
942:
735:
264:
89:
51:
1408:
Bell, Elizabeth A.; Boehnike, Patrick; Harrison, T. Mark; et al. (19 October 2015).
1572:
1500:
1428:
3137:
3065:
2612:
2384:
2182:
2170:
2114:
2109:
2103:
2028:
1951:
1876:
1640:
1613:
1589:
1554:
1455:
1162:
1158:
1129:
1058:
1014:
980:
300:
3147:
2899:
2646:
2301:
2219:
2214:
2165:
2155:
1916:
1795:
1125:
900:
3132:
3089:
2905:
2737:
2607:
2379:
2177:
1891:
1866:
1851:
1817:
1777:
1186: – Academic discipline which examines history from the Big Bang to the present
1108:
1087:
1075:
883:
679:
2929:
2079:
1976:
1938:
1921:
1856:
1837:
1770:
1750:
1550:
1262:
1183:
1141:
1034:
768:
553:
286:
17:
2992:
2923:
2917:
2593:
1846:
1841:
1736:
1083:
1054:
870:
431:
369:
327:
153:
66:
1446:
2536:
2516:
2249:
2209:
1946:
1755:
1437:
1026:
1022:
666:
475:
193:
1649:
1631:
1598:
1464:
1580:
1244: – Chronological outline of major events in the development of plants
2531:
2369:
2013:
1926:
1271: – Development of planet Earth from its formation to the present day
1133:
1100:
1018:
997:
938:
640:
448:
134:
58:
1410:"Potentially biogenic carbon preserved in a 4.1 billion-year-old zircon"
2541:
1765:
1760:
1553:; Christian, Daniel; Wacey, David; Hazen, Robert M. (8 November 2013).
1528:
683:
519:
488:
1700:
1508:
1079:
1050:
1042:
356:
3084:
1667:
1966:
1046:
946:
505:
418:
98:
1900:
1782:
1690:
839:
653:
624:
282:
247:
118:
43:
2566:
1709:
141:, which would have been last emitted 14 minutes after midnight
1800:
1375:"Hints of life on what was thought to be desolate early Earth"
762:
547:
2562:
1705:
1291:"The Universe At Your Fingertips Activity: Cosmic Calendar"
464:; 57% of all biological families and 83% of all genera die
1614:"Early metazoan life: divergence, environment and ecology"
1349:"First Galaxies Born Sooner After Big Bang Than Thought"
1258:
Pages displaying short descriptions of redirect targets
1218: – Scientific projections regarding the far future
46:
in order to help intuit it for pedagogical purposes in
3049:
1691:
More information on the image used for this article.
1192: – Timeline of the universe, Earth, and mankind
3013:
2970:
2957:
2939:
2892:
2861:
2818:
2811:
2788:
2681:
2674:
2666:
Extraordinary claims require extraordinary evidence
2600:
2509:
2493:
2477:
2435:
2345:
2334:
2289:
2281:
Global
Boundary Stratotype Section and Point (GSSP)
2268:
2242:
2233:
2195:
2133:
2088:
2052:
2021:
2012:
1975:
1937:
1816:
1791:
1743:
27:Method to visualize the chronology of the universe
1696:The Cosmic Calendar in a Google Calendar format
1524:"Oldest fossil found: Meet your microbial mom"
1256: – Timeline of events 5th–15th century CE
2578:
1721:
1475:Early edition, published online before print.
267:(discovered in 4.1 billion-year-old rocks in
8:
1211:Timeline of the evolutionary history of life
2962:Carl Sagan Prize for Science Popularization
1333:Episode 1: The Shores of the Cosmic Ocean (
797:. Unsourced material may be challenged and
582:. Unsourced material may be challenged and
2815:
2678:
2585:
2571:
2563:
2342:
2239:
2018:
1813:
1728:
1714:
1706:
1250: – History and future of the universe
1144:in Europe, Classical music to the time of
1701:The Cosmic Calendar relayed in real time.
1639:
1588:
1454:
1436:
1265: – Time coordinate used in cosmology
817:Learn how and when to remove this message
602:Learn how and when to remove this message
231:T(days) = 365 days * ( 1- T_Gya/13.797 )
2660:Search for extraterrestrial intelligence
2276:Global Standard Stratigraphic Age (GSSA)
828:
613:
240:
111:
84:A similar analogy used to visualize the
3056:
1281:
723:Beginning of most recent Glacial Period
2999:Pale Blue Dot: A Tribute to Carl Sagan
2778:The Varieties of Scientific Experience
1664:"Cosmos: A Spacetime Odyssey (@35min)"
2835:God, the Universe and Everything Else
1612:Erwin, Douglas H. (9 November 2015).
1522:Borenstein, Seth (13 November 2013).
533:Cretaceous–Paleogene extinction event
402:Ordovician–Silurian extinction events
228:Date in year calculated from formula
7:
1373:Borenstein, Seth (19 October 2015).
795:adding citations to reliable sources
580:adding citations to reliable sources
1295:Astronomical Society of the Pacific
2075:Adoption of the Gregorian calendar
493:Triassic–Jurassic extinction event
372:(ancestors of insects, arachnids)
75:and on his 1980 television series
42:of 13.8 billion years to a single
25:
1289:Blanchard, Therese Puyau (1995).
462:Permian–Triassic extinction event
3131:
3119:
3107:
3095:
3083:
3071:
3059:
3034:
3033:
1206:Timeline of early modern history
767:
552:
1957:English and British regnal year
65:The concept was popularized by
2746:Shadows of Forgotten Ancestors
922:Early Dynastic period in Sumer
535:, non-avian dinosaurs die out
1:
2070:Old Style and New Style dates
1385:Mindspark Interactive Network
1190:Detailed logarithmic timeline
208:Formation of the Solar System
34:is a method to visualize the
2022:Pre-Julian / Julian
1417:Proc. Natl. Acad. Sci. U.S.A
1227:Timeline of human prehistory
2988:Carl Sagan Memorial Station
2843:Cosmos: A Spacetime Odyssey
2255:Geological history of Earth
2125:Astronomical year numbering
1254:Timeline of the Middle Ages
1242:Timeline of plant evolution
1237:Timeline of natural history
1232:Timelines of modern history
1222:Timeline of human evolution
1201:Timeline of ancient history
221:Oldest rocks known on Earth
139:cosmic background radiation
57:In this visualization, the
3180:
1248:Chronology of the universe
1216:Timeline of the far future
710:Anatomically modern humans
235:Evolution of life on Earth
36:chronology of the universe
3029:
2947:Carl Sagan Memorial Award
2827:Cosmos: A Personal Voyage
2427:Thermoluminescence dating
2322:Samarium–neodymium dating
1335:Cosmos: A Personal Voyage
1140:voyages to the Americas,
926:Indus Valley civilisation
314:Oxygenation of atmosphere
2698:Mars and the Mind of Man
2141:Chinese sexagenary cycle
840:kya (thousand years ago)
436:Late Devonian extinction
90:history of life on Earth
40:currently understood age
2851:Cosmos: Possible Worlds
2762:The Demon-Haunted World
2618:Faint young Sun paradox
2355:Amino acid racemisation
1438:10.1073/pnas.1517557112
1161:; the last 437.5 years
1082:, invention of numeral
964:Middle Kingdom of Egypt
625:Mya (million years ago)
263:First known remains of
248:Gya (billion years ago)
119:Gya (billion years ago)
2360:Archaeomagnetic dating
1872:Era of Caesar (Iberia)
1632:10.1098/rstb.2015.0036
1626:(20150036): 20150036.
1619:Phil. Trans. R. Soc. B
918:First Dynasty of Egypt
736:Sculpture and painting
104:
2770:Billions and Billions
2730:The Cold and the Dark
2690:The Cosmic Connection
2655:The Planetary Society
2628:Voyager Golden Record
2260:Geological time units
1581:10.1089/ast.2013.1030
1383:. Yonkers, New York:
1146:Johann Sebastian Bach
697:Domestication of fire
386:and Proto-amphibians
194:Milky Way Galaxy disk
102:
2978:Carl Sagan Institute
2312:Law of superposition
2307:Isotope geochemistry
1138:Christopher Columbus
791:improve this section
576:improve this section
3005:Symphony of Science
2912:Linda Salzman Sagan
2706:The Dragons of Eden
2445:Fluorine absorption
2422:Luminescence dating
2317:Luminescence dating
2225:Milankovitch cycles
2065:Proleptic Gregorian
1897:Hindu units of time
1573:2013AsBio..13.1103N
1501:2014NatGe...7...25O
1429:2015PNAS..11214518B
1002:classical antiquity
167:First galaxies form
86:geologic time scale
72:The Dragons of Eden
3159:Physical cosmology
3021:900 Stewart Avenue
2547:Terminus post quem
2527:Synchronoptic view
2494:Linguistic methods
2455:Obsidian hydration
2390:Radiometric dating
2375:Incremental dating
2297:Chronostratigraphy
1322:, episode 1 (1980)
508:(avian dinosaurs)
343:multicellular life
137:, as seen through
105:
3164:Time in astronomy
3047:
3046:
2983:Sagan Planet Walk
2888:
2887:
2807:
2806:
2601:Scientific career
2560:
2559:
2473:
2472:
2330:
2329:
2191:
2190:
2146:Geologic Calendar
2008:
2007:
1488:Nature Geoscience
1196:List of timelines
1179:Geologic Calendar
1169:
1168:
1152:31 Dec, 23:59:59
1105:Maya civilization
1031:Achaemenid Empire
960:Code of Hammurabi
905:Stonehenge Cursus
827:
826:
819:
754:
753:
612:
611:
604:
539:
538:
269:Western Australia
226:
225:
94:Geologic Calendar
69:in his 1977 book
48:science education
16:(Redirected from
3171:
3136:
3135:
3124:
3123:
3122:
3112:
3111:
3110:
3100:
3099:
3098:
3088:
3087:
3076:
3075:
3074:
3064:
3063:
3062:
3055:
3037:
3036:
2952:Carl Sagan Medal
2854:(2020 TV series)
2846:(2014 TV series)
2830:(1980 TV series)
2816:
2679:
2587:
2580:
2573:
2564:
2552:ASPRO chronology
2501:Glottochronology
2417:Tephrochronology
2365:Dendrochronology
2343:
2240:
2039:Proleptic Julian
2029:Pre-Julian Roman
2019:
1814:
1730:
1723:
1716:
1707:
1679:
1678:
1676:
1675:
1666:. Archived from
1660:
1654:
1653:
1643:
1609:
1603:
1602:
1592:
1547:
1541:
1540:
1538:
1536:
1519:
1513:
1512:
1509:10.1038/ngeo2025
1482:
1476:
1474:
1472:
1471:
1458:
1440:
1423:(47): 14518–21.
1414:
1405:
1399:
1398:
1396:
1395:
1389:Associated Press
1370:
1364:
1363:
1361:
1360:
1345:
1339:
1330:
1324:
1316:
1310:
1309:
1307:
1306:
1297:. Archived from
1286:
1269:History of Earth
1259:
1119:31 Dec, 23:59:58
1113:Byzantine Empire
1094:31 Dec, 23:59:56
1065:31 Dec, 23:59:55
1039:Classical Greece
1008:31 Dec, 23:59:54
991:31 Dec, 23:59:53
970:31 Dec, 23:59:52
953:31 Dec, 23:59:51
932:31 Dec, 23:59:49
911:31 Dec, 23:59:48
897:Early Bronze Age
890:31 Dec, 23:59:47
877:31 Dec, 23:59:46
863:31 Dec, 23:59:41
849:31 Dec, 23:59:33
829:
822:
815:
811:
808:
802:
771:
763:
742:31 Dec, 23:59:32
680:Primitive humans
614:
607:
600:
596:
593:
587:
556:
548:
241:
180:Milky Way Galaxy
112:
21:
3179:
3178:
3174:
3173:
3172:
3170:
3169:
3168:
3144:
3143:
3142:
3130:
3120:
3118:
3108:
3106:
3096:
3094:
3082:
3072:
3070:
3060:
3058:
3050:
3048:
3043:
3025:
3009:
2966:
2935:
2884:
2857:
2803:
2784:
2670:
2640:Family Portrait
2623:Cosmic Calendar
2596:
2591:
2561:
2556:
2505:
2489:
2485:Molecular clock
2478:Genetic methods
2469:
2450:Nitrogen dating
2437:Relative dating
2431:
2400:Potassium–argon
2347:Absolute dating
2337:
2326:
2285:
2264:
2229:
2205:Cosmic Calendar
2197:Astronomic time
2187:
2129:
2084:
2048:
2034:Original Julian
2004:
1971:
1933:
1832:Ab urbe condita
1810:
1787:
1739:
1734:
1687:
1682:
1673:
1671:
1662:
1661:
1657:
1611:
1610:
1606:
1567:(12): 1103–24.
1549:
1548:
1544:
1534:
1532:
1521:
1520:
1516:
1484:
1483:
1479:
1469:
1467:
1412:
1407:
1406:
1402:
1393:
1391:
1372:
1371:
1367:
1358:
1356:
1355:. 14 April 2011
1347:
1346:
1342:
1331:
1327:
1317:
1313:
1304:
1302:
1288:
1287:
1283:
1279:
1274:
1257:
1174:
1000:; beginning of
985:Minoan eruption
977:Late Bronze Age
943:Akkadian Empire
924:, beginning of
823:
812:
806:
803:
788:
772:
759:
608:
597:
591:
588:
573:
557:
544:
542:Human evolution
326:Complex cells (
237:
154:Gamma Ray Burst
110:
52:popular science
32:Cosmic Calendar
28:
23:
22:
18:Cosmic calendar
15:
12:
11:
5:
3177:
3175:
3167:
3166:
3161:
3156:
3146:
3145:
3141:
3140:
3128:
3116:
3104:
3092:
3080:
3068:
3045:
3044:
3042:
3041:
3030:
3027:
3026:
3024:
3023:
3017:
3015:
3011:
3010:
3008:
3007:
3002:
2995:
2990:
2985:
2980:
2974:
2972:
2968:
2967:
2965:
2964:
2959:
2954:
2949:
2943:
2941:
2937:
2936:
2934:
2933:
2927:
2921:
2915:
2909:
2903:
2896:
2894:
2890:
2889:
2886:
2885:
2883:
2882:
2874:
2865:
2863:
2859:
2858:
2856:
2855:
2847:
2839:
2831:
2822:
2820:
2813:
2809:
2808:
2805:
2804:
2802:
2801:
2792:
2790:
2786:
2785:
2783:
2782:
2774:
2766:
2758:
2750:
2742:
2734:
2726:
2718:
2710:
2702:
2694:
2685:
2683:
2676:
2672:
2671:
2669:
2668:
2663:
2657:
2652:
2651:
2650:
2635:
2625:
2620:
2615:
2613:Pioneer plaque
2610:
2604:
2602:
2598:
2597:
2592:
2590:
2589:
2582:
2575:
2567:
2558:
2557:
2555:
2554:
2549:
2544:
2539:
2534:
2529:
2524:
2522:New Chronology
2519:
2513:
2511:
2510:Related topics
2507:
2506:
2504:
2503:
2497:
2495:
2491:
2490:
2488:
2487:
2481:
2479:
2475:
2474:
2471:
2470:
2468:
2467:
2462:
2457:
2452:
2447:
2441:
2439:
2433:
2432:
2430:
2429:
2424:
2419:
2414:
2413:
2412:
2407:
2402:
2397:
2387:
2385:Paleomagnetism
2382:
2377:
2372:
2367:
2362:
2357:
2351:
2349:
2340:
2332:
2331:
2328:
2327:
2325:
2324:
2319:
2314:
2309:
2304:
2299:
2293:
2291:
2287:
2286:
2284:
2283:
2278:
2272:
2270:
2266:
2265:
2263:
2262:
2257:
2252:
2246:
2244:
2237:
2231:
2230:
2228:
2227:
2222:
2217:
2212:
2207:
2201:
2199:
2193:
2192:
2189:
2188:
2186:
2185:
2183:New Earth Time
2180:
2175:
2174:
2173:
2168:
2158:
2153:
2148:
2143:
2137:
2135:
2131:
2130:
2128:
2127:
2122:
2112:
2107:
2092:
2090:
2086:
2085:
2083:
2082:
2077:
2072:
2067:
2062:
2056:
2054:
2050:
2049:
2047:
2046:
2044:Revised Julian
2041:
2036:
2031:
2025:
2023:
2016:
2010:
2009:
2006:
2005:
2003:
2002:
1997:
1992:
1987:
1981:
1979:
1973:
1972:
1970:
1969:
1964:
1962:Lists of kings
1959:
1954:
1952:Canon of Kings
1949:
1943:
1941:
1935:
1934:
1932:
1931:
1930:
1929:
1924:
1919:
1914:
1904:
1894:
1889:
1884:
1879:
1877:Before present
1874:
1869:
1864:
1859:
1854:
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1685:External links
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1163:before present
1159:Modern History
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1130:Maratha Empire
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1059:Roman Republic
1043:Ashokan Empire
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981:early Iron Age
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3154:Units of time
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3105:
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3093:
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3006:
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2996:
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2989:
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2948:
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2931:
2928:
2925:
2922:
2919:
2916:
2914:(second wife)
2913:
2910:
2907:
2904:
2901:
2900:Lynn Margulis
2898:
2897:
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2780:
2779:
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2772:
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2767:
2764:
2763:
2759:
2756:
2755:
2754:Pale Blue Dot
2751:
2748:
2747:
2743:
2740:
2739:
2735:
2732:
2731:
2727:
2724:
2723:
2719:
2716:
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2714:Broca's Brain
2711:
2708:
2707:
2703:
2700:
2699:
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2673:
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2647:Pale Blue Dot
2644:
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2636:
2633:
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2336:Chronological
2333:
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2302:Geochronology
2300:
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2235:Geologic time
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2220:Metonic cycle
2218:
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2215:Galactic year
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2156:ISO week date
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2027:
2026:
2024:
2020:
2017:
2015:
2011:
2001:
1998:
1996:
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1974:
1968:
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1928:
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1915:
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1898:
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1888:
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1875:
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1870:
1868:
1865:
1863:
1862:Byzantine era
1860:
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1855:
1853:
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1843:
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1818:Calendar eras
1815:
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1807:
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1684:
1670:on 2014-03-11
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1390:
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1344:
1341:
1338:
1337:, Carl Sagan)
1336:
1329:
1326:
1323:
1321:
1315:
1312:
1301:on 2007-12-16
1300:
1296:
1292:
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1199:
1197:
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1188:
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1176:
1171:
1164:
1160:
1157:
1154:
1151:
1150:
1147:
1143:
1139:
1135:
1131:
1127:
1126:Mongol Empire
1124:
1121:
1118:
1117:
1114:
1110:
1106:
1102:
1099:
1096:
1093:
1092:
1089:
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1067:
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1020:
1016:
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1010:
1007:
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999:
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990:
989:
986:
982:
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975:
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958:
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948:
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937:
934:
931:
930:
927:
923:
919:
916:
913:
910:
909:
906:
902:
901:Proto-writing
898:
895:
892:
889:
888:
885:
882:
879:
876:
875:
872:
868:
865:
862:
861:
858:
854:
851:
848:
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843:
841:
838:
835:
831:
830:
821:
818:
810:
800:
796:
792:
786:
785:
781:
776:This section
774:
770:
765:
764:
761:
756:
750:
747:
744:
741:
740:
737:
734:
731:
729:31 Dec, 23:58
728:
727:
724:
721:
718:
716:31 Dec, 23:55
715:
714:
711:
708:
705:
703:31 Dec, 23:52
702:
701:
698:
695:
692:
690:31 Dec, 23:44
689:
688:
685:
681:
678:
675:
673:31 Dec, 22:24
672:
671:
668:
665:
662:
660:31 Dec, 14:24
659:
658:
655:
652:
649:
647:31 Dec, 06:05
646:
645:
642:
639:
636:
633:
632:
628:
626:
623:
620:
616:
615:
606:
603:
595:
585:
581:
577:
571:
570:
566:
561:This section
559:
555:
550:
549:
546:
541:
534:
531:
528:
526:30 Dec, 06:24
525:
524:
521:
518:
515:
512:
511:
507:
504:
501:
498:
497:
494:
490:
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468:
467:
463:
460:
457:
454:
453:
450:
447:
444:
441:
440:
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433:
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427:
424:
423:
420:
416:
413:
410:
407:
406:
403:
399:
396:
393:
390:
389:
385:
382:
379:
376:
375:
371:
368:
365:
362:
361:
358:
354:
351:
348:
347:
344:
340:
337:
334:
333:
329:
325:
322:
319:
318:
315:
312:
309:
306:
305:
302:
299:
296:
293:
292:
288:
284:
281:
278:
275:
274:
270:
266:
262:
259:
256:
255:
251:
249:
246:
243:
242:
239:
234:
232:
229:
222:
219:
216:
213:
212:
209:
206:
203:
200:
199:
195:
192:
189:
186:
185:
181:
178:
175:
172:
171:
168:
165:
162:
159:
158:
155:
152:Oldest known
151:
148:
145:
144:
140:
136:
133:
130:
127:
126:
122:
120:
117:
114:
113:
107:
101:
97:
95:
91:
87:
82:
80:
79:
74:
73:
68:
63:
60:
55:
53:
49:
45:
41:
37:
33:
19:
3126:Solar System
2997:
2926:(third wife)
2906:Dorion Sagan
2902:(first wife)
2876:
2868:
2849:
2841:
2833:
2825:
2795:
2776:
2768:
2760:
2752:
2744:
2736:
2728:
2720:
2712:
2704:
2696:
2688:
2645:
2639:
2622:
2608:Project A119
2465:Stratigraphy
2410:Uranium–lead
2380:Lichenometry
2204:
2178:Winter count
2161:Mesoamerican
2089:Astronomical
1907:Mesoamerican
1892:Sothic cycle
1867:Seleucid era
1852:Bosporan era
1840: /
1830:
1778:Paleontology
1672:. Retrieved
1668:the original
1658:
1623:
1617:
1607:
1564:
1560:Astrobiology
1558:
1551:Noffke, Nora
1545:
1533:. Retrieved
1527:
1517:
1495:(1): 25–28.
1492:
1486:
1480:
1468:. Retrieved
1420:
1416:
1403:
1392:. Retrieved
1378:
1368:
1357:. Retrieved
1352:
1343:
1334:
1328:
1319:
1314:
1303:. Retrieved
1299:the original
1284:
1109:Song dynasty
1088:Gupta Empire
1076:Roman Empire
884:Chalcolithic
869:Flooding of
857:last Ice Age
833:
813:
807:January 2021
804:
789:Please help
777:
760:
618:
598:
592:January 2021
589:
574:Please help
562:
545:
238:
230:
227:
83:
76:
70:
64:
56:
31:
29:
3114:Outer space
3102:Spaceflight
2971:Recognition
2930:Sasha Sagan
2405:Radiocarbon
2080:Dual dating
1939:Regnal year
1917:Short Count
1857:Bostran era
1838:Anno Domini
1771:Big History
1751:Archaeology
1535:15 November
1263:Cosmic time
1184:Big History
1142:Renaissance
1074:astronomy,
1055:Archimedean
1049:completed,
1035:Qin dynasty
855:End of the
749:Agriculture
684:stone tools
398:Land plants
287:Prokaryotes
265:biotic life
3148:Categories
2993:2709 Sagan
2932:(daughter)
2924:Ann Druyan
2918:Nick Sagan
2819:Television
2594:Carl Sagan
2000:Vietnamese
1912:Long Count
1847:Anno Mundi
1842:Common Era
1744:Key topics
1737:Chronology
1674:2014-03-11
1470:2015-10-20
1394:2015-10-20
1359:2015-11-07
1305:2007-12-15
1277:References
1111:, rise of
1053:geometry,
871:Doggerland
432:Amphibians
370:Arthropods
328:Eukaryotes
283:First Life
67:Carl Sagan
3078:Astronomy
2878:Wanderers
2537:Year zero
2517:Chronicle
2460:Seriation
2395:Lead–lead
2269:Standards
2250:Deep time
2210:Ephemeris
2096:Lunisolar
2060:Gregorian
2053:Gregorian
2014:Calendars
1977:Era names
1947:Anka year
1826:Human Era
1756:Astronomy
1447:1091-6490
1353:Space.com
1072:Ptolemaic
1057:physics,
1051:Euclidean
1027:Confucius
1023:Zoroaster
778:does not
563:does not
476:Dinosaurs
108:Cosmology
3039:Category
2638:Voyager
2632:contents
2532:Timeline
2370:Ice core
2243:Concepts
1990:Japanese
1922:Tzolk'in
1887:Egyptian
1650:26554036
1599:24205812
1465:26483481
1172:See also
1134:Crusades
1101:Muhammad
1019:Mahavira
998:Iron Age
939:Alphabet
667:Hominids
641:Primates
449:Reptiles
135:Big Bang
88:and the
59:Big Bang
3138:Science
3066:History
3052:Portals
3014:Related
2870:Contact
2797:Contact
2789:Fiction
2682:Science
2542:Floruit
2290:Methods
2151:Iranian
2119:Islamic
1985:Chinese
1796:Periods
1766:History
1761:Geology
1641:4650120
1590:3870916
1569:Bibcode
1529:AP News
1497:Bibcode
1456:4664351
1425:Bibcode
799:removed
784:sources
584:removed
569:sources
520:Flowers
489:Mammals
415:Insects
357:animals
355:Simple
196:formed
182:formed
160:26 Jan
146:19 Jan
92:is the
2940:Prizes
2893:Family
2881:(2014)
2873:(1997)
2838:(1988)
2800:(1985)
2781:(2006)
2773:(1997)
2765:(1995)
2757:(1994)
2749:(1993)
2741:(1985)
2733:(1984)
2725:(1980)
2722:Cosmos
2717:(1979)
2709:(1977)
2701:(1973)
2693:(1973)
2662:(SETI)
2338:dating
2134:Others
2100:Hebrew
1995:Korean
1806:Epochs
1648:
1638:
1597:
1587:
1463:
1453:
1445:
1380:Excite
1320:Cosmos
1080:Christ
1015:Buddha
844:Event
634:30 Dec
629:Event
513:28 Dec
499:27 Dec
482:26 Dec
469:25 Dec
455:24 Dec
442:23 Dec
425:22 Dec
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377:17 Dec
363:14 Dec
341:First
307:29 Oct
294:30 Sep
276:21 Sep
257:14 Sep
252:Event
187:13 May
173:16 Mar
163:12.85
123:Event
78:Cosmos
3090:Stars
2920:(son)
2908:(son)
2862:Films
2812:Media
2738:Comet
2675:Books
2171:Aztec
2115:Lunar
2110:Solar
2104:Hindu
1967:Limmu
1927:Haab'
1882:Hijri
1413:(PDF)
1047:Vedas
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832:Date
745:0.012
732:0.035
617:Date
529:0.065
506:Birds
419:seeds
349:7 Dec
335:5 Dec
320:9 Nov
214:6 Sep
201:2 Sep
149:13.1
128:1 Jan
2166:Maya
1901:Yuga
1801:Eras
1783:Time
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654:Apes
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472:0.23
458:0.25
428:0.36
417:and
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352:0.67
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131:13.8
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1433:doi
1421:112
1122:1.0
1097:1.5
1068:2.0
1011:2.5
994:3.0
979:to
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956:4.0
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893:5.5
880:6.0
866:8.3
793:by
706:0.2
693:0.4
676:2.5
578:by
485:0.2
445:0.3
411:0.4
380:0.5
338:0.8
310:2.4
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