What characteristic defines a satellite placed in Geostationary Earth Orbit (GEO)?

Answer

Its orbital period matches the Earth's rotation period (24 hours).

A GEO satellite is synchronized with the Earth's rotation, causing it to appear fixed in the sky when viewed from the ground, which is achieved by maintaining a 24-hour orbital period.

What characteristic defines a satellite placed in Geostationary Earth Orbit (GEO)?
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