Moon’s Sphere of Influence (MSI):
ISRO confirmed that the Chandrayaan-3 Propulsion Module (PM) re-entered the Moon’s Sphere of Influence (MSI) during its high-altitude Earth-bound orbit, undergoing two lunar flybys.The Moon’s Sphere of Influence (MSI) is the region around the Moon where its gravitational influence dominates over Earth’s for orbital calculations.Inside this region, it is mathematically more accurate to treat a spacecraft as orbiting the Moon, with Earth acting as a perturbing body.The MSI is an imaginary, approximately spherical (or oblate spheroid) region surrounding the Moon. For the Earth–Moon system, the MSI radius is roughly ~66,000 km from the Moon’s center (approximate, varies with models).
