meridian

n. 子午线,经线,顶点
a. 子午线的,日中的,顶点的

He is at the meridian of life.

他正值壮年。

The angular distance north or south of the earth's equator, measured in degrees along a meridian, as on a map or globe.

纬度地球赤道北或南的角距离，例如在地图或地球仪上沿着子午线用度数测量