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An arc second is a measurement of an angle, so you would need to know how far away the object is. From there, there are two ways to proceed:

1. Use a circle with the distance as the radius

a. find the degree fraction (degrees/360; there are 3600 arcseconds in 1 degree)

b. find the circumference of the circle and multiply by the degree fraction

2. Set up a triangle and use a trigonometric function.

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16y ago

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