why diameter is consider as a arc when we measure distance between planet

Asked by Kashif | 21st Apr, 2012, 10:15: PM

Expert Answer:

When the radius is very large, the arc will be nearly straight line. When we use parallax method the distance between the moon and the earth is very large , so the diameter will be considered as arc.   

Answered by  | 21st Apr, 2012, 10:22: PM

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