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A transit of Venus takes place when Venus passes directly between the Sun and the Earth (or any other superior planet), becoming visible against (and hence obscuring a small portion of) the solar disk. During a transit, Venus is visible as a small black circle moving across the face of the Sun. Transits of Venus reoccur periodically.
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Map of planets of the Solar System, Halley's Comet, Pluto and Ceres during the transit of Venus on 5-6 June 2012, viewed perpendicular to the ecliptic directly above the Sun. Brighter parts of orbits are nearer to the viewer than the ecliptic and darker parts are farther. Planet sizes are to scale,and orbits are to (a different) scale.
The orbit of Venus is 224.7 Earth days (7.4 avg. Earth months [30.4 days]). The phases of Venus result from the planet's orbit around the Sun inside the Earth's orbit giving the telescopic observer a sequence of progressive lighting similar in appearance to the Moon's phases. It presents a full image when it is on the opposite side of the Sun.
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Printable version; In other projects ... The surface of Venus has been divided into 8 quadrangles at the 1:10,000,000 map scale, [1] ... Diagram of Venus' 1:5,000,000 ...
The black drop effect was long thought to be due to Venus's thick atmosphere, and indeed it was held to be the first real evidence that Venus had an atmosphere. However, it is now thought by many to be an optical effect caused by the combination of the extreme darkening of the Sun's disk near its apparent edge and the intrinsic imperfection of ...
1639 transit of Venus; 1769 transit of Venus observed from Tahiti; 1874 transit of Venus; 1874 Transit of Venus Expedition to Campbell Island; 1874 Transit of Venus Expedition to Hawaii; 1882 transit of Venus; 2004 transit of Venus; 2012 transit of Venus