During an eclipse, the moon entirely covers the sphere of the sun, therefore it can be said that both moon and the sun appear the same size form earth or they subtend the same solid angle on earth. Let ω be the solid angle subtended on earth, in which case we have,
where Asun and Amoon, are the projected areas of the sun and moon as seen from earth and Rse, and Rme � are the distances of sun and moon from earth. Let Rsun and Rmoon be the radii of the sun and the moon.
Then we have
Therefore, the distances of sun and moon are relative to their sizes.
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