Glossary term: 经度
Description: 地球是一个球体，为了定义地球表面上的位置，地球表面被绘上了两组假想线。经线是穿过地球南北两极的大圆线。赤道可以作为纬度0度的自然参考位置，但0度经线的位置需要人为确定。国际公认的0度经线穿过英国伦敦的格林尼治，因此也被称为本初子午线或格林尼治子午线。位于地球另一侧的180度经线称为对跖子午线，基于此设立了国际日期变更线。地球周长共360度。此外，那些与赤道平行的小圆线被称为纬线。
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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
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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