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galactic quadrant : ウィキペディア英語版
galactic quadrant

A galactic quadrant, or quadrant of the Galaxy, refers to one of four circular sectors in the division of the Milky Way Galaxy.
==Quadrants in the galactic coordinate system==
In actual astronomical practice, the delineation of the galactic quadrants is based upon the galactic coordinate system, which places the Sun as the pole of the mapping system. The Sun is used instead of the Galactic Center for practical reasons since all astronomical observations (by humans) to date have been based on Earth or within the solar system.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「galactic quadrant」の詳細全文を読む



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