Duba wurin da ke ƙasa sannan ka amsa tambayar daga baya a cikin harshe ɗaya kamar yadda wurin yake:  Passage: 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 wata, ya bambanta daga crescent zuwa gibbous zuwa cikakke kuma akasin haka. Lokacin da Venus ya fi nisa daga Rana a sararin sama, yana nuna rabin haske, kuma lokacin da ya fi kusa da Rana a sararin sama, yana nunawa azaman crescent ko cikakken lokaci. Wannan zai yiwu ne kawai idan Venus ya kewaye da Sun, kuma wannan yana daga cikin abubuwan da aka fara lura da shi wanda ya saba wa tsarin Ptolemaic na geocentric wanda tsarin hasken rana ya kasance mai ma'ana kuma ya kasance a duniya. Jirgin 1639 na Venus ya annabta daidai da Irmiya Horrocks kuma ya lura da shi da abokinsa, William Crabtree, a kowane gidajensu, a ranar 4 ga Disamba 1639 (Nuwamba 24 a ƙarƙashin kalandar Julian da ake amfani da ita a wancan lokacin). An gano yanayin Venus a 1761 ta masanin ilimin Rasha Mikhail Lomonosov. An lura da yanayin Venus a 1790 ta masanin ilimin taurari na Jamus Johann Schröter. Schröter ya gano lokacin da duniyar ta kasance mai laushi mai laushi, cusps ya kara ta fiye da 180 °. Ya yi tsammani daidai wannan ya faru ne saboda watsawar hasken rana a cikin yanayi mai kauri. Daga baya, masanin taurari na Amurka Chester Smith Lyman ya lura da cikakken zobe a kusa da gefen duhu na duniyar duniyar lokacin da yake a ƙananan haɗin kai, yana ba da ƙarin tabbaci ga yanayi. Yanayin yanayi ya rikitar da ƙoƙari don ƙayyade lokacin juyawa don duniyar, kuma masu sa ido irin su masanin tauraron dan adam Giovanni Cassini da Schröter ba daidai ba sun kiyasta lokutan kimanin awa 24 daga motsin alamomi a kan duniyar duniyar.  Tambaya: Wace duniya ce ta saɓa wa tsarin Ptolemy na dā?
Venus