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Transit of Venus, 2012
(詳細はVenus appeared as a small, dark disk moving across the face of the Sun, began at 22:09 UTC on 5 June 2012, and finished at 04:49 UTC on 6 June. Depending on the position of the observer, the exact times varied by up to ±7 minutes. Transits of Venus are among the rarest of predictable celestial phenomena and occur in pairs, eight years apart, which are themselves separated by more than a century: The previous transit of Venus took place on 8 June 2004 (preceded by the pair of appearances on 9 December 1874 and 6 December 1882), and the next pair of transits will occur on 10–11 December 2117 and in December 2125.
==Observations of the event==
The entire transit was visible from the western Pacific Ocean, northwesternmost North America, northeastern Asia, Japan, the Philippines, eastern Australia, New Zealand, and high Arctic locations including northernmost Scandinavia, and Greenland. In North America, the Caribbean, and northwestern South America, the beginning of the transit was visible on 5 June until sunset. From sunrise on 6 June, the end of the transit was visible from South Asia, the Middle East, east Africa, and most of Europe. The phenomenon was not visible from most of South America, nor from western Africa. There were a number of live online video streams with footage from telescopes around the world. Midway through the transit one of the NASA streams had nearly 2 million total views and was getting roughly 90,000 viewers at any given moment.
In Los Angeles, crowds jammed Mount Hollywood where the Griffith Observatory set up telescopes for the public to view the transit. In Hawaii, hundreds of tourists watched the event on Waikiki Beach where the University of Hawaii set up eight telescopes and two large screens showing webcasts of the transit. The transit was also observed and photographed by a flight engineer aboard the International Space Station, Don Pettit.
NASA's Solar and Heliospheric Observatory could not see the transit as it was not in between the Earth and the Sun at the time of the event, but high-definition images of the event were obtained by Solar Dynamics Observatory, from above the Earth. Agency astrophysicist Dr. Lika Guhathakurta said, "We get to see Venus in exquisite detail because of SDO's spatial resolution, SDO is a very special observatory. It takes images that are about 10 times better than a high-definition TV and those images are acquired at a temporal cadence of one every 10 seconds. This is something we've never had before".
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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