Linked from
The 63 pages that link to Orbital mechanics, each with the reason it gives.
Roche limitNarrower topic: The Roche limit constrains which close orbits can preserve a satellite.
Vostok 1Narrower topic: The mission's single orbit depended on achieving a stable path around Earth.
Stellar streamNarrower topic: Escaped stars spread along paths governed by their progenitor’s orbit.
SatelliteNarrower topic: It describes the gravitational paths that satellites follow.
Dyson sphereNarrower topic: A swarm must maintain stable orbits around its host star.
Alfred WordenNarrower topic: It governed the trajectories Worden monitored around the Moon.