Glossary term: 軌道週期
Description: 軌道週期是一個天體繞另一個天體運行一圈所需的時間。換一種說法，它是一個天體在其軌道上返回到同一點所需的時間。這可能是一顆行星繞著一顆中心恆星運行（例如地球繞著太陽運行）；可能是一顆衛星繞著一顆行星運行；可能是一顆恆星、一群恆星或星雲繞著一個星系的中心運行；也可能是兩顆恆星（雙星系統）繞著它們共同的質量中心運行。
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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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