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The small angle formula is used for measuring the distance to a far away object when the actual size and angular size are known, or for finding out the actual size of a faraway object when the distance to the object and angular size are known.
In arc-seconds:
a = 206265 x D/d
where a = the angular size of the object in arc-seconds
D = the actual linear size of an object in km
d = the distance to the object in km
206265 = the number of arc-seconds in a complete circle divided by 2pi
In Radians:
a = D/d
where a = angular size of object in radians
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