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It is an apparent distance of two celestial objects in the sky. It is measured in degrees and in fractions of degree.
It is also often referred to with the term separation, as in the case of two double stars, when it is said that their apparent separation is of a certain angular value.
The angular distance of a celestial body can be measured with a sextant, an instrument that is used, especially in navigation.
The most common method of locating a star, or a point on the Earth's surface, is to use its angular distance in degrees, minutes and seconds to certain fixed points or reference lines.
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