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Mars hoax
The Mars hoax was a hoax circulated by e-mail that began in 2002, that claimed that Mars would look as large as the full Moon to the naked eye on August 27, 2003. The hoax, which has since resurfaced every year from 2005 through 2015, began from a misinterpretation and exaggeration of a sentence in an e-mail message that reported the close encounter between Mars and the Earth in August 2003. At that time, the distance between the two planets was about 55,758,000 kilometers, which was the closest distance between them since September 24, 57,617 BC, when the distance has been calculated to have been about 55,718,000 kilometers.
== Background ==
Both Earth and Mars are in elliptical orbits around the Sun in approximately the same plane. By the nature of the laws of physics, the distance between them varies periodically from a minimum equal to the distance between their orbits at some point along them, to a maximum when they are on opposite sides of the Sun. These minimum (opposition) and maximum distances vary considerably as the two planets progress along their elliptical orbits, and occur about every 780 days. Mars was closer to the Earth in August 2003 (at the opposition) than it had been since 57,617 BC, and than it will be until 2287.
There was another opposition on 30 October 2005, but with a minimum distance about 25% greater than in 2003 (as reported in the original email, text below) and apparent diameter correspondingly smaller. The magnitude was −2.3, about 60% as bright as 2003. (The Moon has an apparent diameter of around 30 minutes of arc, i.e., 1800 arcseconds, with magnitude of about −12.7 when full, about 9,000 times brighter than Mars in the 2003 approach.)
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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