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Hey! This is a spreadsheet I made which implements the formula in xkcd.com/1017. Feel free to take/modify it for your own use. Note that while the date calculation will always be accurate, currently the historical notes are just text attached to each percentage, so they'll gradually drift out of sync (the first few already have). —RMDownload and edit/view formulas (I don't know a way to distribute the Google Doc directly)

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http://xkcd.com/1017/backintime.ods

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PercentYearssecondminutehourdaymonthyearmillion yearsbillion yearsHow far backDateWhat's Happening

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10.00%0.4113027114.883687217118.5813947833618.64302324638150.7767926352664.953758127009820.412813177250820.0000004128131770.0000000004128135 monthsSeptember 17, 2011Lybian Rebels advance on Sirte

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Fitocracy 100kYearssecondminutehourdaymonthyearmillion yearsbillion yearsHow far backDateWhat's Happening

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7,3080.165052938.4556292584215.64092715421403.5940154525758.48308397719041.921456528428920.160121377369080.0000001601213770.0000000001601212 monthsDecember 18, 2011Kim Jong-Il dies, US troops leave Iraq

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DatePercent complete

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1/1/191844.04%

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Years agoPercent complete

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101257.85%

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PercentTsecondminutehourdaymonthyearmillion yearsbillion yearsHow long agoDateEvents (As of February 9th—now out of sync)

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0.00%0.0000000000Now21:44:43Now

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1.00%0.0012895.1809556329214.9196825938823.581994709898040.149249779579080.0049035882487090.0004086323540590.0000000004086320.0000000000004094 hours18:09:47Breakfast

.

2.00%0.00103168.7936699961719.4798944999428.65799824166561.19408326006940.0392314994271320.0032692916189280.0000000032692920.0000000000032691 dayFebruary 13, 2012Santorum wins three caucuses

.

3.00%0.01348261.9853465145804.3664224418996.73944037403164.030810015584650.132431904964560.011035992080380.0000000110359920.0000000000110364 daysFebruary 10, 2012Romney wins Nevada

.

4.00%0.03825820.69593319513763.6782655532229.3946377592219.55810990663420.314030851839250.0261692376532710.0000000261692380.00000000002616910 daysFebruary 5, 2012Romney wins Florida, Concordia divers quit search

.

5.00%0.051613932.5086968626898.8751449477448.31458574912818.67977440621370.613722328603560.051143527383630.0000000511435270.00000000005114419 daysJanuary 27, 2012Joe Paterno dies, Gabrielle Giffords resigns, SOPA/PIPA protests effective

.

6.00%0.092791459.6429131146524.3273818852775.40545636475332.30856068186471.061494890907650.0884579075756380.0000000884579080.0000000000884581 monthJanuary 13, 2012Costa Concordia runs aground, Gingrich declines in polls

.

7.00%0.144438470.174281973974.50290469841232.9083817449751.37118257270721.687795639606490.140649636633870.0000001406496370.000000000140652 monthsDecember 25, 2011Kim Jong-Il dies, US troops leave Iraq

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8.00%0.216636770.88900767110612.8481501281843.547469168876.81447788203322.523732846610090.210311070550840.0000002103110710.0000000002103113 monthsNovember 30, 2011Gingrich passes Romney in polls, crackdown in Syria turns violent

.

9.00%0.309470546.85765337157842.4476275562630.70746045927109.612810852473.601319162547360.300109930212280.000000300109930.000000000300114 monthsOctober 28, 2011Herman Cain tops polls, Gaddafi killed

.

10.00%0.4113027114.883687217118.5813947833618.64302324638150.7767926352664.953758127009820.412813177250820.0000004128131770.0000000004128135 monthsSeptember 17, 2011Lybian Rebels advance on Sirte

.

11.00%0.5517397800.4809961289963.3413499364832.72235583226201.3634314930116.615777652560160.551314804380010.0000005513148040.0000000005513157 monthsJuly 28, 2011Phone hacking scandal breaks, Norway massacre

.

12.00%0.7222678951.022587377982.5170431166299.70861738527262.487859057728.624015289899830.718667940824990.0000007186679410.0000000007186689 monthsMay 28, 2011Osama bin Laden killed, Iceland volcano erupts

.

13.00%0.9228973101.257113482885.0209518838048.08368253139335.33682010547511.01746143321650.918121786101380.0000009181217860.00000000091812211 monthsMarch 16, 2011Japan tsunami

.

14.00%1.1536390311.6131822606505.19355303710108.4198925506421.18416218960913.83796823070631.153164019225520.0000011531640190.0000000011531641 yearDecember 20, 2010Tea party sweep

.

15.00%1.4345049704.7357751750828.41226291912513.8068710486521.40861962702717.13083387586421.427569489655350.000001427569490.0000000014275691 yearSeptember 11, 2010Wikileaks posts state department cables

.

16.00%1.7555081231.6938716918020.52823119315300.3421371866637.51425571610620.94547423473721.74545618622810.0000017454561860.0000000017454562 yearsMay 18, 2010iPad released, health care reform law passed

.

17.00%2.1166627706.47843861110461.7746406418507.6962440107771.15401016711425.33619649465912.111349707888260.0000021113497080.000000002111352 yearsJanuary 4, 2010Haiti, Ft. Hood, Michael Jackson

.

18.00%2.5379847156.0473561330785.934122622179.76556871924.1568986962530.36309280449552.530257733707960.0000025302577340.0000000025302583 yearsAugust 4, 2009Green revolution, swine flu

.

19.00%3.0194915543.61202751581925.7268671226365.42878111871098.5595325466136.09307584570583.007756320475480.000003007756320.0000000030077563 yearsFebruary 11, 2009Obama inaugurated, Tea party forms

.

20.00%3.55112029935.5327881867165.5922131331119.42653688551296.6427723702342.60108309238043.550090257698360.0000035500902580.000000003550094 yearsJuly 28, 2008Obama beats Clinton, financial system collapses

.

21.00%4.16131412197.6439842190203.294066436503.388234441520.9745097683449.97148239494644.164290199578870.00000416429020.000000004164294 yearsDecember 16, 2007Mortgage crisis, last Harry Potter book

.

22.00%4.86153313325.7568322555222.0959471942587.03493245321774.4597888522258.29971871959574.858309893299640.0000048583098930.000000004858315 yearsApril 7, 2007Virginia Tech massacre, iPhone

.

23.00%5.64178018538.3655712966975.6394261949449.59399043652060.3997496015267.6942507270865.64118756059050.0000056411875610.0000000056411886 yearsJune 25, 2006Gas above $4.00, Democrats poised to win House and Senate

.

24.00%6.52205853288.3239683430888.1387327957181.46897887992382.5612074533378.27883680395856.523236400329880.00000652323640.0000000065232367 yearsAugust 7, 2005Hurricane Katrina, Terri Schiavo

.

25.00%7.52237190385.8833363953173.098055665886.21830092672745.2590958719490.19524370584397.516270308820320.0000075162703090.000000007516278 yearsAugust 9, 2004Bird flu panic, tsunami, Facebook, Mars rovers

.

26.00%8.63272458469.8027514540974.4967125275682.90827854213153.45451160592103.6064678256728.633872318805960.0000086338723190.0000000086338729 yearsJune 28, 2003Iraq invaded, same-sex marriage legalized in MA

.

27.00%9.89312152118.5798155202535.3096635886708.92182772633612.87174282193118.7005801426119.891715011884290.0000098917150120.00000000989171510 yearsMarch 26, 20029/11, Afghanistan

.

28.00%11.31356843963.193765947399.3865626799123.32310937784130.13846289074135.69533227645711.30794435637140.0000113079443560.00000001130794411 yearsOctober 24, 2000Bush/Gore election, Google, Segway, Windows XP

.

29.00%12.90407199249.9561736786654.16593622113110.9027656044712.95428190015154.84369423260912.90364118605080.0000129036411860.00000001290364113 yearsMarch 21, 1999Clinton impeached/acquitted, Columbine massacre, The Matrix

.

30.00%14.70463993412.1189967733223.5353166128887.0589219435370.29412174764176.44053627267714.7033780227230.0000147033780230.00000001470337815 yearsJune 2, 1997Princess Diana dies

.

31.00%16.74528133348.2797828802222.47132971146703.7078554956112.65449397896200.83072035098416.7358933625820.0000167358933630.00000001673589317 yearsMay 22, 1995OJ Simpson trial, Windows 95

.

32.00%19.03600683282.80761910011388.0467936166856.4674465616952.35281027337228.41893393397419.03491116116450.0000190349111610.00000001903491119 yearsFebruary 1, 1993Clinton inaugurated

.

33.00%21.64682896309.55950311381605.1593251189693.4193220847903.89247175351259.68168497704821.6401404147540.0000216401404150.0000000216401422 yearsJune 26, 1990Soviet Union collapses, Tiananmen Square, Gulf War

.

34.00%24.60776253009.6105112937550.1601752215625.8360029198984.40983345497295.18198690250424.5984989085420.0000245984989090.00000002459849925 yearsJuly 11, 1987Challenger, Pan Am Flight 103, Iran-Contra

.

35.00%27.97882508905.76342814708481.7627238245141.36271206310214.223446336335.58740389697327.96561699141440.0000279656169910.00000002796561728 yearsFebruary 27, 1984Reagan crushes Mondale, Macintosh introduced, I'm born

.

36.00%31.811003752996.6315816729216.6105263278820.27684210511617.5115350877381.6923093846931.80769244872420.0000318076924490.00000003180769232 yearsApril 25, 1980Mt. St. Helens, AIDS, PCs, Empire Strikes Back

.

37.00%36.201142480234.8604619041337.2476744317355.62079457313223.1508664405434.44544697116636.20378724759710.0000362037872480.00000003620378736 yearsDecember 2, 1975Watergate, Roe v. Wade, Microsoft, Ebola, Elvis dies

.

38.00%41.251301681622.6240221694693.7104004361578.22850667315065.7595211114494.98419062288241.24868255190680.0000412486825520.00000004124868341 yearsNovember 16, 1970Moon landing, Kent State, Nixon

.

39.00%47.061484956653.275524749277.5545917412487.95924319417186.9983017998564.67730231138247.05644185928190.0000470564418590.00000004705644247 yearsJanuary 24, 1965Civil rights, Kennedy shot, Six Day War

.

40.00%53.761696654212.1977328277570.2032956471292.83672159319637.2015300664645.17851169983953.76487597498660.0000537648759750.00000005376487654 yearsMay 11, 1958Elvis, velcro, Great Leap Forward, Castro, Cuban missiles

.

41.00%61.541942049872.2800432367497.8713341539458.29785556822477.4290773153738.4939354386761.54116128655580.0000615411612870.00000006154116162 yearsAugust 1, 1950DNA, Stalin dies, Color TV, Polio vaccine, Elizabeth

.

42.00%70.592227569929.070137126165.4845016618769.42474169425782.0593642372847.06726993188270.58893916099010.0000705889391610.00000007058893971 yearsJuly 14, 1941Pearl Harbor, World War II, Manhattan Project

.

43.00%81.162561075720.6612742684595.3443545711409.92240590929642.0801002462973.88790828891781.1573256907430.0000811573256910.00000008115732681 yearsDecember 19, 1930Great Depression, Dust Bowl, Hitler, Prohibition ends, Babe Ruth

.

44.00%93.552952226045.9654749203767.4327579820062.79054596534169.28293941521122.6287553727793.55239628106390.0000935523962810.00000009355239694 yearsJuly 28, 1918Chaplin, Titanic, Russian Revolution

.

45.00%1083412941214.8656356882353.5810938948039.22635156339501.63443131511297.82268991262108.1518908260520.0001081518908260.000000108151891108 yearsDecember 22, 1903Flight, movies, Relativity, New York subway, San Francisco earthquake

.

46.00%1253957999963.7050565966666.06175091099444.4343625145810.18476510481505.08955067719125.4241292230990.0001254241292230.000000125424129125 yearsSeptember 12, 1886telephones, Krakatoa, machine guns, cars, RADAR, coke, movie cameras

.

47.00%1464605810884.012276763514.73353661279391.9122256153307.99634273381751.42948395403145.9524569961690.0001459524569960.000000145952457146 yearsMarch 3, 1866Civil War, Lincoln shot, dynamite invented

.

48.00%1705379414165.8937989656902.76489651494281.7127482862261.73803117822045.60387167677170.4669893063980.0001704669893060.000000170466989170 yearsAugust 28, 1841Wrenches, vulcanized rubber, bicycle, stamps, US I.R.

.

49.00%2006307788786.77145105129813.1128571752163.5518809673006.81466170662398.63240977935199.8860341482790.0001998860341480.000000199886034200 yearsMarch 28, 1812Photos, War of 1812, cement, battery, machine tools, Waterloo

.

50.00%2357427566805.42162123792780.090362063213.00150685967.20839608352824.44499451993235.3704162099940.000235370416210.000000235370416235 yearsOctober 1, 1776American and French revolutions, Haiti rebellion, Industrial Revolution, Napoleon

.

51.00%2788785293017.60722146421550.2934542440359.17155756101681.6321482323340.74099082614278.3950825688450.0002783950825690.000000278395083278 yearsSeptember 23, 1733First Great Awakening, Enlightenment, Qianlong Emperor expansion, Enlightenment

.

52.00%33110440418974.4043174006982.9067392900116.38177898120838.1825741243970.12775319943330.8439794332860.0003308439794330.000000330843979331 yearsApril 11, 1681Newton's Principia, Ming Dynasty collapses, Great Turkish War, Salem witch trials

.

53.00%39512469291098.5412207821518.3090193463691.97181699144320.4988257084741.63716747444395.136430622870.0003951364306230.000000395136431395 yearsDecember 26, 1616Logarithms, Kepler, 30 Years' War, Plymouth Rock, Jamestown, Shakespeare

.

54.00%47414970491761.3234249508196.0220574158469.93370094173269.5805708735692.75667637318474.3963896977650.0004743963896980.00000047439639474 yearsSeptember 13, 1537Reformation, Columbian Exchange, Copernicus, Sack of Rome, Cortés, Pizarro

.

55.00%57318072031859.7225301200530.9953745020008.84992291209167.0354134546872.16436609356572.680363841130.0005726803638410.000000572680364573 yearsJune 2, 1439Agincourt, Joan of Arc, end of Byzantine Empire, Moctezuma I, printing press, Zheng He

.

56.00%69521941091343.3444365684855.7224066094747.59537344253947.8164738938343.43294950625695.2860791255210.0006952860791260.000000695286079695 yearsOctober 25, 1316Tenochtitlan, Renaissance, Chaucer, Lake Poyang, Ming dynasty, Black Death

.

57.00%84926797286152.0196446621435.8669937443690.59778321310153.77490763410190.0747205051849.1728933754280.0008491728933750.000000849172893849 yearsDecember 7, 1162Mongol empire, explosive weapons, windmills, compass, Crusades

.

58.00%1,04432930844193.8551548847403.2309199147456.72051532381144.03002147112522.45324549061043.537770457550.0010435377704580.000001043537771044 yearsJuly 27, 0968Classical China and Islam, gunpowder, zero invented, moveable type, Mayan collapse

.

59.00%1,29140727655638.1446678794260.63574311313237.6772624471384.90321926615487.3091173981290.60909311650.0012906090931160.0000012906090931291 yearsJuly 4, 0721Muslim conquests, Constantinople flourished, Beowulf composed, Tang Dynasty, Viking raids

.

60.00%1,60750704007751.2277845066795.85379514084446.5975633586851.94156513619280.9684041511606.747367012580.0016067473670130.0000016067473671607 yearsMay 16, 0405Teotihuacan, collapse of western Roman Empire, vandals, Atilla the Hun, Christianity

.

61.00%2,01463555047313.86251059250788.5643817654179.8094063735590.82539192724167.77121830642013.980934858860.0020139809348590.0000020139809352014 years1 BCRoman Empire, Jesus, Pyramid of the Son, London, Pompeii

.

62.00%2,54280222823497.61581337047058.293622284117.6382266928504.90159277630505.94605338392542.162171115320.0025421621711150.0000025421621712542 years530 BCRome founded, Roman Republic, Battle of Thermopylae, corn, Mexican writing, Alexander

.

63.00%3,232101992437762.8061699873962.7134428331232.71189071180468.0296621138784.17224167833232.014353473190.0032320143534730.0000032320143533232 years1220 BCEgypt conquers Nubia, Exodus, Judaism, Athens, Classical Greece, wheel, ironsmithing, alphabet

.

64.00%4,139130628802496.7692177146708.2794936285778.47132481511907.436305249673.58450183474139.465375152890.0041394653751530.0000041394653754139 years2127 BCAncient Egypt, pyramids, Ur, Bristlecone pine Methusaleh, chariots, Stonehenge

.

65.00%5,342168572458771.8492809540979.5308146825682.99218021951070.1246741864102.23561295045341.852967745870.0053418529677460.0000053418529685342 years3329 BCOtzi, Sumerian language, Minoans, silk, pottery, copper, bronze, dams, harps, Mayan day zero

.

66.00%6,947219221864531.6523653697742.194260894962.36990332537290.0987459783362.44078125176946.870065104310.0069468700651040.0000069468700656947 years4934 BCMesopotamia, wheel, copper, first cities, animal husbandry, menhirs, beer, maize

.

67.00%9,106287343154030.3754789052567.1729279817542.78621533325730.94942564109266.5948851869105.549573765540.0091055495737660.0000091055495749106 years7093 BCEngland separated, Norway megatsunami, wine, Jericho, cows, metal ornaments, agriculture

.

68.00%12,031379669119475.4156327818657.92358105463644.2987264394318.51244693144374.9443348512031.24536123750.0120312453612380.00001203124536112,000 years12,000 years agoIce withdraws, Clovis culture, people settling into permanent locations, domestic reindeer

.

69.00%16,028505781070349.3558429684505.82258140494741.763715853947.5734879192330.92746179316027.57728848280.0160275772884830.00001602757728816,000 years16,000 years agoLast glacial maximum, land bridge blocked by ice, permafrost/ice cover Europe, ice sheets in Tibet

.

70.00%21,530679416628301.29211323610471.6882188726841.1948037863618.3831168258358.48337284221529.87361440350.0215298736144040.00002152987361422,000 years22,000 years agoNets, dogs domesticated, recent glacial advance starts, Neanderthals go extinct, wall paintings, Japan colonized

.

71.00%29,167920423562934.49115340392715.5749255673211.92624810653050.496927350005.02765871229167.0856382260.0291670856382260.00002916708563829,000 years29,000 years agoCeramic art, bow and arrow, spear thrower, lunar calendars, first known shaman

.

72.00%39,8551257700814843.2920961680247.3882349361337.45647114556722.3940196478259.82103517939854.98508626490.0398549850862650.00003985498508640,000 years40,000 years agoHumans colonize colder areas, tools spread into Europe, Cro-Magnon, people in Australia

.

73.00%54,9381733659419803.8928894323663.3981481572061.05663520065502.5440265659250.30346320354937.52528860030.05493752528860.00005493752528955,000 years55,000 years agoBig increase in diversity of artifacts, better stone tools, settlements, flint tools, art

.

74.00%76,4032411041524088.8440184025401.4806669733756.69134427905573.1954726916835.12820398976402.92735033240.0764029273503320.0000764029273576,000 years76,000 years agoFishing in Congo, behavioral modernity, bone tools, Homo sapiens spreads

.

75.00%107,2173383426531767.9556390442196.1324939840703.26887439160029.30286971286599.28376578107216.6069804810.107216606980480.00010721660698107,000 years107,000 years agoFirst Homo sapiens expeditions out of Africa

.

76.00%151,8384791548285039.6679859138083.99431330985634.7332455457734.78055161822058.94934561151838.2457788010.15183824577880.000151838245779152,000 years152,000 years agoHomo sapiens evolves, Mitochondrial Eve and Y-Chromosomal Adam in Africa

.

77.00%217,0316848844514956.02114147408582.61902456809.7100179269033.73791692604377.06119222217031.4217660180.217031421766020.000217031421766217,000 years217,000 years agoCooked food, flint and stone tools, Neandertals, prepared core technique

.

78.00%313,1429881794256437.16164696570940.6192744942849.01032114372618.7087633757702.22680419313141.8522336830.313141852233680.000313141852234313,000 years313,000 years agoGlacial began, Neanderthals thrive

.

79.00%456,13214394139281917.8239902321365.2973998372022.75495166598834.2814565473589.89966402456132.4916386680.456132491638670.000456132491639456,000 years456,000 years agoHomo heidelbergensis (ancestor of Neanderthals and Homo sapiens), burying dead, controlled fire

.

80.00%670,85121170006482783.2352833441379.725880557356.32867245023223.1803618050216.22970881670851.3524757340.670851352475730.000670851352476671,000 years671,000 years agoHomo heidelbergensis and many other homonids arise, possible use of fire

.

81.00%996,32431440933300743.3524015555012.3888733592583.5398363899690.98082511955892.0182985996324.334858210.996324334858210.000996324334858996,000 years996,000 years agoHomo antecessor common

.

82.00%1,494,40447158781137687.7785979685628.12813099661427.1355545819226.13064517932842.18390041494403.515325031.494403515325030.0014944035153251.5 million years1.5 million years agoHomo erectus first uses crude stone tools

.

83.00%2,264,02571445655839780119076093066319846015511.05826917312.96041627168294.85391692264024.571159742.264024571159740.002264024571162.3 million years2.3 million years agoHomo genus emerges from Australopithecus, modern Ice Ages begin

.

84.00%3,464,9251093423725533531822372875889.2230372881264.82031265536719.3675141579096.48444033464924.707036693.464924707036690.0034649247070373.5 million years3.5 million years agoIsthmus of Panama forms, cooling oceans. Africa hits Europe, forming Mediterranean, Australopithecus

.

85.00%5,357,4621690650297318252817750495530.4246962508258.84031956771177.4516864289543.19547335357461.932956115.357461932956110.0053574619329565.4 million years5.4 million years agoAfrica hits Europe, forming Mediterranean. Messian salinity crisis

.

86.00%8,370,0912641343348916544402238914860.9173370648581.01513057110357.5423100441089.2031338370090.766927778.370090766927770.0083700907669288.4 million years8.4 million years agoHimalayas start to rise, gorillas split off from hominids, owls, crows, all bird families

.

87.00%13,214,7864170180242828166950300404713.6115838340078.564826597503.27333158577432.17475313214786.014562713.21478601456270.01321478601456313 million years13 million years agoAfrica collides with Asia, Greenland ice cap develops, wave of extinctions, permanent cooling, great apes

.

88.00%21,086,38266542140757486311090356792914.4184839279881.9067701636661.7461253036588.30767621086382.35897321.0863823589730.02108638235897321 million years21 million years agoIce cap began forming, grasses diversified

.

89.00%34,010,1901.07E+1517887617292545.9298126954875.76512421956453.1569408122275.70090434010189.64174234.0101896417420.03401018964174234 million years34 million years agoIce began to build up in Antarctica, higher and narrow-nosed primates evolve

.

90.00%55,454,1571.75E+1529166045486693.5486100758111.55920254198254.6483665449884.27194155454157.022661855.45415702266180.05545415702266255 million years55 million years agoAsteroid impact kills most dinosaurs, PE warming, acidic oceans, mammals proliferated

.

91.00%91,417,6962.88E+1548081024669359.9801350411155.99933389600464.83331097012356.9374391417696.411452491.41769641145240.09141769641145291 million years91 million years agoEurope is island chain, sauropods grow huge, Tyrannosaurs dominant, birds replace pterosaurs, flowers

.

92.00%152,387,9334.81E+15801482451677751335804086129.5855658503588.73271828655190.70208152387932.558507152.3879325585070.15238793255851152 million years152 million years agoPangea began to separate, ancestral Rocky Mountains form, large conifers dominate, ginkgos, dinosaurs

.

93.00%256,890,4988.11E+151351112403440352251854005733.9193827250238.9133082685970.97937256890497.581614256.8904975816140.25689049758161257 million years257 million years agoPangea dominates, hot and dry, massive extinction wipes out nearly all life, winged insects and trees

.

94.00%438,001,5841.38E+162303663926189123839439876981.87159976661540.9115256019002.58774438001583.548978438.0015835489780.43800158354898438 million years438 million years agoLand vertibrates, sea scorpions, invertebrates diversify, green plants and fungi

.

95.00%755,416,5852.38E+163973104211809966621840353016.6275910014709.0259064999021.39813755416585.116511755.4165851165110.75541658511651755 million years755 million years agoPossible snowball earth, multicellular organisms followed by Cambrian explosion

.

96.00%1,318,055,0814.16E+1669322944387248111553824064541.4481409336022.55615816660966.57871318055080.548231318.055080548231.318055080548231.3 billion years1.3 billion years agoComplex single-celled life, primordial supercontinent, green algae colonies, stable cratons

.

97.00%2,326,857,7117.34E+161.22E+1520396799053900.6849866627245.85727922292535.94622326857711.328852326.857711328852.326857711328852.3 billion years2.3 billion years agoCyanobacteria form, oxygen fills atmosphere, most life wiped out, several snowball Earth episodes

.

98.00%4,156,696,6451.31E+172.19E+1536436824553587.41518201023066.1449880359735.74264156696644.645214156.696644645214.156696644645214.2 billion years4.2 billion years agoSolar system coalesces from nebula, sun ignites, Earth forms, impact forms Moon, late heavy bombardment, life

.

99.00%7,514,880,6082.37E+173.95E+1565874036447748.42744751518656.1990178567301.51337514880608.459447514.880608459447.514880608459447.5 billion years7.5 billion years agoMilky Way forms from disc of matter, along with clusters and superclusters, full of heavy nova debris

.

100.00%13,751,310,9534.34E+177.23E+151205414172372095022559051550.36165015731434.15513751310952.846313751.310952846313.751310952846313.8 billion years13.8 billion years agoBig Bang, universe cools, first stars and quasars form, first generation of supernovas create heavy elements