Qeybta hoose ka dibna ka jawaab su'aasha ka dib luqadda la mid ah sida marinka: Passage: The deferent-iyo-epicycle model ayaa loo isticmaalay by astronomers Greek qarniyo iyo fikrad ah ee eccentric ah (deferent ah oo wax yar off-center ka Earth), taas oo ahayd xitaa ka weyn. In sawirka, xarunta deferent ma aha Earth laakiin kaalinta calaamadeeyay X, taas oo ka dhigaya eccentric (ka Greek ἐκ ec- macnaheedu yahay "ka", iyo κέντρον kentron macnaheedu yahay "dhexe"), kaas oo kaalinta qaadataa magaceeda ka. Nasiib darro, nidaamka in la heli karo in waqti Ptolemy ee aan si fiican u dhigma aragtiyada, inkastoo ay si weyn u soo hagaagtay ka badan nidaamka Hipparchus ee. Inta badan si fiican u muuqataa in size ee loop dib u dhac ah meeraha (gaar ahaan in of Mars) waxay noqon lahayd ka weyn, oo mararka qaarkood ka yar ka badan la filayo, taasoo keentay in 30 darajo oo kala duwan ee heer
Cilmiga xiddigiska ee Giriigga