angular measure


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Related to angular measure: Radians

angular measure

Units of angle or length given in terms of degrees (°), arc minutes (′), and arc seconds (″):
60″ = 1′
60′ = 1°
360° = 2π radians (a full circle)
.
References in periodicals archive ?
Nearly 450 light-years away in the constellation Aquarius, it is one of the closest and largest-appearing planetary nebulae; its apparent diameter is nearly half the angular measure of the Moon.
Volume 1, like Burnham's, begins with a roughly 100-page introduction to the astronomy that an amateur really needs to know: the celestial sphere and the sky's motions, the magnitude system, angular measures, and so on, along with lots about the various types of objects to be seen in amateur scopes.