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The September equinox (or Southward equinox) is the moment when the Sun appears to cross the celestial equator, heading southward. Due to differences between the calendar year and the tropical year, the September equinox can occur at any time from the 21st to the 24th day of September. At the equinox, the Sun rises directly in the east and sets directly in the west. Before the Southward equinox, the Sun rises and sets more and more to the north, and afterwards, it rises and sets more and more to the south. ==Occurrences== The September equinox is one point in time commonly used to determine the length of the tropical year. Date and time of the September equinox〔http://www.usno.navy.mil/USNO/astronomical-applications/data-services/earth-seasons〕 that occurred from the year 2000 to 2010 are listed as follows: 2001-09-22 23:04 2002-09-23 04:55 2003-09-23 10:47 2004-09-22 16:30 2005-09-22 22:23 2006-09-23 04:03 2007-09-23 09:51 2008-09-22 15:44 2009-09-22 21:18 2010-09-23 03:09 2011-09-22-13:22 (See sidebox for the current decade) 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「september equinox」の詳細全文を読む スポンサード リンク
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