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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Angles can't convert into lengths.
They are the same.
You can't convert that.
2000
You can't convert that.