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 Lords Commissioners of the Admiralty to observe the transit of Venus across the sun, a phenomenon that would be visible from Tahiti on 3 June 1769. He arrived in Tahiti's Matavai Bay, commanding on 12 April 1769. On 14 April, Cook met with Tutaha and Tepau. On 15 April, Cook picked the site for a fortified camp at Point Venus along with Banks, Parkinson, Daniel Solander, to protect Charles Green's observatory. The length of stay enabled them to undertake for the first time real ethnographic and scientific observations of the island. Assisted by the botanist Joseph Banks, and by the