Glossary term: 子午线
Description: 经线也称为子午线。本初子午线被定义为 0 度经线。它穿过英国伦敦的格林尼治，也被称为格林尼治子午线。180度经线位于 地球的另半边，经度180 度，是国际日期变更线的基础。
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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
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astroEDU educational activity (links to astroEDU website) Description: How to navigate at sea like an explorer?License: CC-BY-4.0 Creative Commons 署名 4.0 国际 (CC BY 4.0) icons
Tags: Clocks , Geography , Coordinates , Celestial navigation , James Cook , Exploration Age Ranges: 14-16 , 16-19 Education Level: Middle School , Secondary Areas of Learning: Discussion Groups , Modelling , Social Research Costs: Low Cost Duration: 2 hours Group Size: Group Skills: Analysing and interpreting data , Asking questions , Communicating information , Developing and using models , Planning and carrying out investigations , Using mathematics and computational thinking
