Glossary term: 經度
Description: 地球是一個球體，為了定義地球表面上的位置，地球表面被繪上了兩組假想線。經線是穿過地球南北兩極的大圓線。赤道可以作為緯度0度的自然參考位置，但0度經線的位置需要人為確定。國際公認的0度經線穿過英國倫敦的格林尼治，因此也被稱為本初子午線或格林尼治子午線。位於地球另一側的180度經線稱為對跖子午線，基於此設立了國際日期變更線。地球周長共360度。此外，那些與赤道平行的小圓線被稱為緯線。
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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
The OAE Multilingual Glossary is a project of the IAU Office of Astronomy for Education (OAE) in collaboration with the IAU Office of Astronomy Outreach (OAO). The terms and definitions were chosen, written and reviewed by a collective effort from the OAE, the OAE Centers and Nodes, the OAE National Astronomy Education Coordinators (NAECs) and other volunteers. You can find a full list of credits here. All glossary terms and their definitions are released under a Creative Commons CC BY-4.0 license and should be credited to "IAU OAE".
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