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I would like to know how to calculate the time, or fraction of orbital period, that a satellite spends in umbra? (total solar eclipse for satellite when they aren't affected by Solar radiation pressure and solar panels don't generate power).

Information given would be satellite's orbit radius from the center of Earth, and orbit would be assumed circular.

Thank you and kind regards,

T

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# Calculate time (or fraction of orb. period) of sat. in umbra

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