しごせん
Noun
1.
meridian, meridian line
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宇宙飛行士は、子午線に沿って地球を周回する。
Astronauts orbit the Earth along meridians.
本初子午線は、経度の基準となる子午線です。
The Prime Meridian is the meridian that serves as the standard for longitude.
各地の子午線は、地球の自転と太陽の位置に基づいて、時刻を決定する上で重要な役割を果たす。
Meridians in various locations play an important role in determining time based on the Earth's rotation and the sun's position.
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