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Old 01-07-2017, 12:40 AM
markn+ markn+ is offline
Join Date: Feb 2015
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The angular diameter of Mars as seen from Earth varies quite a bit depending on the position of the planets in their orbits, from about 3.5 arc seconds to over 25. So Earth's angular diameter as seen from Mars should vary in the same way, except Earth would be about twice the diameter, varying between 7 and 50 arc seconds.