Transit of Venus

1639 Transit of Venus

The book of science

Tom Sharp

Jeremiah Horrocks astronomy

Transit of Venus

Black drop effect


In 1769, the young Joseph Banks accompanied Captain James Cook on his voyage to Tahiti to measure the transit of Venus. Measurements in 1761 and 1769 improved Horrock’s number but, because of optical problems, were not definitive.

See also in The book of science:

Readings on wikipedia: