EntityQ1619930· pop 6· linked from 81 articlesHipparchic cycleSign in to saveastronomical cycle he createdConnectionslunar monthEntityyearEntityGregorian calendarEntityThalesEntityDemocritusEntityPtolemyEntityJulian calendarEntityHesiodEntityStraboEntityzodiacEntityEratosthenesEntityAnaximanderEntity4th century BCEntitysolsticeEntityHipparchusEntityheliocentrismEntitygeocentric modelEntityastrolabeEntityApollonius of PergaEntityAristarchus of SamosEntityCategoriesAncient Greek astronomyCalendarsTime in astronomy