What causes longitudinal drift and inclination changes for satellites in Geostationary Orbit?

Answer

The gravitational pull of the Sun and Moon, along with the Earth's slight oblateness

Even without atmospheric drag, external gravitational influences from other celestial bodies and the non-spherical shape of the Earth perturb the precise slot required for GEO operations.

What causes longitudinal drift and inclination changes for satellites in Geostationary Orbit?

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