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What is angular distance?

The illustration shows an observer and two stars. The angular distance between star 1 and star 2 is the angle d. This angle is the angle between the lines connecting the observer's eye with each of the stars.

The illustration shows an observer and two stars. The angular distance between star 1 and star 2 is the angle d. This angle is the angle between the lines connecting the observer's eye with each of the stars.

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