1769 Transit of Venus observed from Tahiti while voyaging to (unsuccessfully) observe the 1761 Transit in Sumatra. Using the solar parallax values obtained from the 1769 transit, Hornsby wrote in "Philosophical Transitions" December 1771 that "the mean distance from the Earth to the Sun (is) 93,726,900 English miles." The radar-based value used today for the astronomical unit is . This is only a difference of eight-tenths of one percent. Considering what these astronomers had to work with, their results were "absolutely remarkable". 1769 Transit of Venus observed from Tahiti On June 3, 1769, British navigator Captain James Cook, British naturalist Joseph Banks, British astronomer Charles Green and
Tahiti rail accounts, the Tahiti rail was sufficiently well documented for there to be no doubt that it existed. The Tahiti rail has historically been confused with the extant Tongan subspecies of the buff-banded rail, "Gallirallus philippensis ecaudatus", which was also illustrated and described by the Forsters. In his 1783 description of the Tongan bird (wherein it was named "Rallus eucaudata"), the English ornithologist John Frederick Miller erroneously gave its locality as Tahiti, which led the Tahiti rail to be regarded as a junior synonym of the extant bird. He based his description on Forster's illustration (plate no.127) of the Tongan bird,