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
John Blaxland (explorer) John Blaxland (explorer) John Blaxland (4 January 1769 – 5 August 1845) was a pioneer settler and explorer in Australia. Blaxland was born in Kent, the eldest son of gentleman farmer John Blaxland and Mary, "née" Parker, of Fordwich, Kent, England. He was the older brother of early Australian explorer Gregory Blaxland. His father died when he was eleven and the family moved to Canterbury where he and his brother were educated at The King's School. In 1887 he joined the army and rose to become a captain. He resigned his commission in 1792 and returned to manage the family