…In the annual motion of the sun on the celestial sphere, the time interval from when the sun passes the vernal equinox to when it goes around the ecliptic and then returns to the vernal equinox is called the solar year, or tropical year, and is 365.2422 days. Because of precession, the vernal equinox moves backwards (from east to west) on the ecliptic at a rate of 50" per year, so the solar year is the time it takes for the sun to move 360° from west to east on the ecliptic, which is 0.0141 days shorter than the sidereal year.… *Some of the terminology that mentions "tropical year" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…天球上の太陽の年周運動において,太陽が春分点を通過して黄道を一周し,再び春分点に戻るまでの時間間隔を太陽年,あるいは回帰年tropical yearといい,365.2422日である。歳差によって春分点は黄道上を50″/年の割合で逆行する(東から西に動く)ので,太陽年は,太陽が黄道上を西から東に360゜運動するのに要する時間,恒星年より0.0141日だけ短い。… ※「tropical year」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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