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
SS Empire Explorer general cargo, sugar and 38 bags of mail. She left the convoy at the Clyde, arriving on 15 May. "Empire Explorer" sailed on 1 June to join Convoy OS 30, which departed from Liverpool that day and arrived at Freetown, Sierra Leone on 19 June. She was in ballast and armed with a 4-inch or 4.7-inch gun, eight machine guns and a number of kites. She was stated to be bound for George, South Africa. She arrived at Demerara on 21 June, sailing nine days later for Trinidad, where she arrived on 1 July. "Empire Explorer" sailed from Trinidad on