Lokacin da masanin kimiyyar lissafi na Italiya Galileo Galilei ya fara lura da duniyar a farkon karni na 17, ya gano cewa ya nuna matakai kamar na Moon, wanda ya bambanta daga crescent zuwa gibbous zuwa cikakke kuma akasin haka. Lokacin da Venus ya fi nisa daga Sun a sararin samaniya, yana nuna rabin haske, kuma lokacin da yake kusa da Sun a sararin samaniya, yana nuna shi a matsayin crescent ko cikakkiyar lokaci. Wannan zai yiwu ne kawai idan Venus ya kewaye da Sun, kuma wannan yana daga cikin farkon lura da ya saba wa samfurin Ptolemaic geocentric cewa Solar System yana da hankali da kuma kewaye da Duniya. 1639 wucewar Venus ya yi daidai da Jeremiah Horrocks kuma ya lura da shi da abokinsa, William Crabtree, a gidajensu, a ranar 4 ga watan Nuwamba, 1639 a kowace shekara a ƙarƙashin kalandar Julian.
Venus