1 文書を見つけるための辞書。

• line of longitude, meridian
• 子午線, 経線, 経度
• an imaginary great circle on the surface of the earth passing through the north and south poles at right angles to the equator; "all points on the same meridian have the same longitude"
• 南極と北極を通り、赤道と直角に交わる、地表の想像上の大円