trezor.io
Rate this file (Rating : 5 / 5 with 1 votes)
Transit of Venus across the Sun
trezor.io

Transit Of Venus Across The Sun

Observations were also made from Tahiti at a location still known as "Point Venus". This occurred on the first voyage of James Cook, after which Cook explored New Zealand and Australia.
The unfortunate Guillaume Le Gentil spent eight years travelling in an attempt to observe either of the transits. His unsuccessful journey led to him losing his wife and possessions and being declared dead (his efforts became the basis of the play Transit of Venus by Maureen Hunter).
Unfortunately, it was impossible to time the exact moment of the start and end of the transit because of the phenomenon known as the "black drop effect". This effect was long thought to be due to Venus' thick atmosphere, and initially it was held to be the first real evidence that Venus had an atmosphere. However, recent studies demonstrate that it is an optical effect caused by the smearing of the image of Venus by turbulence in the Earth's atmosphere or imperfections in the viewing apparatus.
In 1771, using the combined 1761 and 1769 transit data, the French astronomer Jérôme Lalande calculated the astronomical unit to have a value of 153 million kilometers (±1 million km). The precision was less than hoped-for because of the black drop effect, but still a considerable improvement on Horrocks' calculations.

File information
Filename:484128.jpg
Album name:Earth & Universe
Rating (1 votes):55555
Keywords:#transit #venus #sun
Filesize:64 KiB
Date added:Jun 07, 2012
Dimensions:700 x 468 pixels
Displayed:131 times
URL:displayimage.php?pid=484128
Favorites:Add to Favorites