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
Dutch frigate Mars (1769) arrived at Whampoa on 11 December. She crossed the Second Bar on 22 March 1787, and was at Mew Bay (some two miles east of Tanjung Layar), by 11 May. She arrived at Mauritius on 15 June, and left on 4 August. By 21 September she was at St Helena, which she left on 2 October. "Mars" arrived at The Downs on 8 December, but was lost on the Margate Sands the next day. The pilot made an error that resulted in her stranding. The cost of the loss was £70,000. Notes Citations References Dutch frigate Mars (1769) John May