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出典:『Wikipedia』 (2011/01/14 03:22 UTC 版)

英語による解説

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Spring Meridian is a part of the equinox meridiator that has the celestial longitude 0° (±0°) (0h). It is also called celestial Prime Meridian, First point of Aries Meridian, Pisces Meridian, March Meridian, Vernal Meridian, and Midnight Meridian because during the course of the year, the sun passes through this meridian on March 20 or 21 as it travels from southern to northern hemispheres and western to eastern hemispheres along the ecliptic.