So the transit of Venus is now being used to help us learn about other Solar Systems.
Hubble will focus its cameras on the moon for the full six hours of the transit of Venus.
In 1639, the transit of Venus (its passage across the Sun's disc) was first observed by astronomer Jeremiah Horrocks.
For measurement purposes, the transit of Venus is as obsolete as a sextant.
I'm so focused on making sure I have the answers to your questions, I knew nothing about the transit of Venus.
James Cook, a year into his circumnavigation of the world, observed the transit of Venus over the Sun's disc, the main purpose of his voyage.
The transit of Venus can't be observed with the Hubble Space Telescope because the extreme brightness of the sun would destroy the telescope and its instruments.
That year Captain James Cook set off on the Endeavour, sailing to the South Seas to chart the transit of Venus and search for what turned out to be Australia.
Jay Pasachoff, an astronomer at Williams College, in Massachusetts, and a member of Dr Schneider's team, will be observing the transit of Venus from Thessaloniki, in Greece, to test this theory.
The reason astronomers want to observe reflected sunlight during the transit of Venus is to test whether they can detect the faint imprint of passage of the sun's light through the atmosphere of Venus.
Halley did not live to measure the next transit of Venus, in 1761, but others mounted worldwide expeditions that did the trick.
And, curiously, the forthcoming transit of Venus may have a role to play here, too.
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