Explanation given by Mr Roland Zurmely:
“The Clarke Belt”, the only place where geostationary satellites may be, is already almost all busy! Theoretically, each satellite GSO should be a “box” of 0.1 x 0.1 degrees, and as the belt is 360 degrees, there is room for only 3600 GSO satellites! Already has more than 1500 seating! The Clarke belt is at the equator! Old satellites MUST be removed from the belt and are normally placed in inclined orbit with respect to GSO to give the “box” to a new GSO satellite.
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