| 释义 |
恒星年héngxīngnián地球绕太阳一周实际所需的时间,也就是从地球上观测,以太阳和某一个恒星在同一位置上为起点,当观测到太阳再回到这个位置时所需的时间。一恒星年等于365天6小时9分10秒。{sidereal year; time it takes for the earth to complete one revolution in its orbit around the sun as measured with a certain star as reference. One sidereal year equals 365 days, 6 hours, 9 minutes and 10 seconds of solar time.} |