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1.of a celestial body: reach its highest altitude or the meridian.
关于天体；达到最高海拔或者顶峰。收藏指正
2.an instrument that measures the altitude and azimuth of celestial bodies; used in navigation.
用来测量天体的高度和角度的装置；通常用于航海。收藏指正
3.A medieval instrument, now replaced by the sextant, that was once used to determine the altitude of the sun or other celestial bodies.
星盘一种中世纪的仪器，曾用来测量太阳或其它天体的高度，现在已被六分仪取代收藏指正
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