I roto i nga wa e rua, Galileo te mea ki te kua pohehe Neptune mo te whetu pūmau, ka puta tata i roto i te conjunction ki a Jupiter i te rangi po; reira, e kore te mea ia i whakawhiwhia ki te kitea o Neptune. I tona kitenga tuatahi i roto i Hakihea 1612, Neptune ko tata pūmau i roto i te rangi no te mea i tahuri tika hoki taua ra. hanga tenei nekehanga hoki kitea ina tangohia te aorangi o te whenua i te reira mua i te aorangi waho. no te mea i te tīmatanga o tona huringa retrograde tau i muri mai, i kitea te nekehanga o te aorangi i tawhiti rawa ki te kia rite ki te mea e mohiotia inaianei ki te tūnga o Neptune o Galileo. I roto i te Hōngongoi 1844, i te tono a Sir George James Chardon Adams Kaiwhakahaere o te Whare Wananga o Cambridge, i haere tonu ia ki te whakaputa i te maha o ngā raraunga hou e pā ana ki a Neptune i roto i te tatauranga, i te whakamahi i te papaaata ātaahua, i tuku i te reira i
Hui-tanguru 1844