- Semi-synchronous orbit
**Semi-Synchronous Orbit**: An orbit with approximately a 12-hour period. A circular Semi-Synchronous Orbit is at an altitude of approximately 20,200 km. [*cite paper | title=NASA Technical Standard 8719.14 (draft) | publisher = NASA Orbital Debris Program Office | date = 8 Aug 2006 | url = http://www.orbitaldebris.jsc.nasa.gov/library/references.html/ | format =*]pdf **ee also***

Medium Earth Orbit (MEO)

*List of orbits **References**

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