noun
Technical astronomy term for an orbit where a satellite's orbital period matches Earth's rotation, appearing stationary relative to the ground.
通信衛星は同期軌道に投入された。
The communications satellite was placed into geosynchronous orbit.
静止軌道 is a specific type of geosynchronous orbit directly above the equator with zero inclination, while 同期軌道 is the broader category.
Compound of 同期 (synchronization) and 軌道 (orbit), directly describing an orbit synchronized with Earth's rotation.