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 Bay before returning to Point Venus where he met Tu, the paramount chief. Cook picked up two passengers from Tahiti during this trip, Porea and Ma'i, with Hitihiti later replacing Porea when Cook stopped at Raiatea. Cook took Hitihiti to Tahiti on 22 April, during his return leg. Then, Cook departed Tahiti on 14 May 1774. Pautu and Tetuanui returned to Tahiti with Bonechea aboard "Aguila" on 14 November 1774, Tipitipia and Heiao having passed away in the interim. Bonechea died on 26 January 1775 in Tahiti, and was buried near the Spanish mission at Tautira Bay. Lt. Tomas Gayangos