Astronomy Hypertext_ Greek Geocentric and Heliocentric Cosmologies

Astronomy Hypertext_ Greek Geocentric and Heliocentric Cosmologies

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1/15/12 Astronomy Hypertext: Greek Geocentric and Heliocentric Cosmologies 1/2 physics.gmu.edu/~jevans/«/history_greekGeocentricHeliocentric.html Astronom\ H\perte[t Greek Geocentric and Heliocentric Cosmologies Latest Modification: Jul\ 22, 2002 AV eaUl\ aV 2000 B.C. Whe Bab\lonianV had begXn UecoUding Whe moYemenWV of planeWV, and a WhoXVand \eaUV laWeU Whe GUeekV had inheUiWed mXch of WhaW knoZledge. The GUeekV, Zho Wo a gUeaW e[WenW aUe UeVponVible foU deYeloping geomeWU\ and WUigonomeWU\, VoXghW a geomeWUical e[planaWion of planeWaU\ moWionV UaWheU Whan Whe Vimpl\ nXmeUical UelaWionVhipV foXnd b\ Whe Bab\lonianV. FoU Whem Wo Vee Whe EaUWh, Zhich ZaV noW in WheiU mindV a planeW, aV Whe cenWeU of a ZoUld V\VWem ZaV noW XnUeaVonable, eYen WhoXgh Whe\ ZeUe aZaUe of Whe difficXlW concepW of a VpheUical EaUWh. A geocentric (Earth-centered) cosmolog\ ceUWainl\ VeemV moUe inWXiWiYel\ obYioXV Whan doeV, Va\, a heliocentric (Sun-centered) cosmolog\ . FoU cenWXUieV, YaUioXV GUeek VchoolV of philoVoph\ pUopoVed, debaWed oYeU, and elaboUaWed on VeYeUal geocenWUic WheoUieV. An\ concepWXal Vcheme had Wo e[plain Whe obVeUYed moWionV of Whe SXn, Moon, and fiYe naked-e\e planeWV, all of Zhich Veemed Wo ZandeU among Whe VWaUV. NeYeU changing WheiU coXUVe, Whe SXn and Moon moYe eaVWZaUd on Whe celeVWial VpheUe in a VomeZhaW VWead\ faVhion UelaWiYe Wo Whe VWaUV. The infeUioU planeWV, hoZeYeU, moYe eaVWZaUd WhUoXgh Whe backgUoXnd VWaUV of Whe ]odiac foU a Wime and When XndeUgo UeWUogUade moWion, moYing ZeVWZaUd. The VXpeUioU planeWV geneUall\ folloZ an eaVWZaUd paWh UelaWiYe Wo Whe backgUoXnd VWaUV ZiWh onl\ a bUief peUiod of UeWUogUade moWion ZeVWZaUd. All Whe planeWV fXUWheU confoXnd an XndeUVWanding of WheiU moWion b\ moYing VZifWl\ Vome
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This note was uploaded on 01/16/2012 for the course ASTR 103 taught by Professor Staff during the Spring '08 term at George Mason.

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Astronomy Hypertext_ Greek Geocentric and Heliocentric Cosmologies

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