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  1. sidereal period

    • n.
      the period of revolution of one body about another with respect to the distant stars.
    • noun: sidereal period, plural noun: sidereal periods

  2. 知識+

    • 怎麼跟外國人解釋農曆阿?

      ... (synodic months) in a solar year, this period (354.37 days) is sometimes referred to as lunar year, corresponding to thirteen sidereal months (355.18 days). Examples...