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Message: <blockquote data-quote="tOhmtMistressBekki" data-source="post: 1430125" data-attributes="member: 240245">A geostationary orbit is circular.  A geosynchronous orbit (any orbit with a 24 period) can be elliptical.  In reality ANY orbit is going to have some eccentricity, so even the ground tracks of comm satellites do little figure 8s.But anyway...Centripetal acceleration on the satellite= omega^2 r = (2 pi / T)^2 r=Acceleration due to gravity= G M / r^2Solve for the orbital radius:r = cubert (G M T^2 / (4 pi^2) )Then subtract the radius of the earth (given) from that to get your altitude.  They give you the mass, M.  You'll have to look up newton's big G.  And of course the period, T, is one day, which you will want to convert to seconds.  Then plugnchug.</blockquote>