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 flows, all occurring from 2.75 to 2.29 Ma. Huahine consists of two coalesced basalt shield volcanoes, Huahine Nui and Huahine Iti, with several flows followed by post-shield trachyphonolitic lava domes from 3.08 to 2.06 Ma. Moorea consists of at least 16 flows of shield-stage basalt and post-shield lavas from 2.15 to 1.36 Ma. Tahiti consists of two basalt shield volcanoes, Tahiti Nui and Tahiti Iti, with an age range of 1.67 to 0.25 Ma. November to April is the wet season, the wettest month of which is January with of rain in Papeetē. August is the driest with . The