子し午ご線せん

noun

meridian (geography)

In geography, an imaginary line on the earth's surface connecting the North and South Poles; used for longitude and time zones.

• 日本にほん標ひょう準じゅん時じは東とう経けい135度どの子し午ご線せんに基もとづいている。

  Japan Standard Time is based on the meridian at 135 degrees east longitude.

noun

meridian (astronomy)

In astronomy, the great circle on the celestial sphere passing through the celestial poles and the zenith of a given location.

• 天てん体たいが子し午ご線せんを通つう過かすることを「南なん中ちゅう」と呼よぶ。

  The passage of a celestial body across the meridian is called 'culmination'.