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A-train (satellite) : ウィキペディア英語版
A-train (satellite constellation)

The A-train (from Afternoon Train) is a satellite constellation of six Earth observation satellites of varied nationality in sun-synchronous orbit at an altitude of 705 kilometers above the Earth.〔«A-train Symposium October 2007: Constellation keeps its promises», ''CNESMAG'', January 2008〕
The orbit, at an inclination of 98.14°, crosses the equator each day at around 1:30 pm solar time, giving the constellation its name; the "A" stands for "afternoon;"〔NASA, (Introducing the A-Train ), 10.26.10 (accessed April 30 2012)〕 and crosses the equator again on the night side of the Earth, at around 1:30 am.
They are spaced a few minutes apart from each other so their collective observations may be used to build high-definition three-dimensional images of the Earth's atmosphere and surface.
==Satellites==


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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