Glossary term: 週期
Description: 在天文學中，許多過程是週期性的：它們定期重複。例如，行星繞太陽的軌道就是如此，行星沿著相同的軌跡一次又一次地繞太陽運行。一個週期的一次重複過程開始到下一次重複過程開始所需的時間被稱為週期。例如，一個行星的軌道週期就是行星繞太陽轉一圈所需的時間。重複過程不需要是完美的，軌道週期可以隨著時間的推移緩慢變化。例如，通過對雙中子星週期逐漸減小的觀測提供了引力波輻射的第一個間接證據。
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Term and definition status: The original definition of this term in English have been approved by a research astronomer and a teacher The translation of this term and its definition is still awaiting approval
This is an automated transliteration of the simplified Chinese translation of this term
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