Editing Geosynchronous orbit (section)

===Period===
All geosynchronous orbits have an orbital period equal to exactly one sidereal day.<ref>{{cite book |editor-first1=Vladimir|editor-last1=Chobotov |year=1996 |title=Orbital Mechanics |publisher=AIAA Education Series |page=304|edition=2nd|location=Washington, DC|isbn=9781563471797|oclc=807084516}}</ref> This means that the satellite will return to the same point above the Earth's surface every (sidereal) day, regardless of other orbital properties.<ref>
{{cite book |title=Fundamentals of Astrodynamics and Applications |last=Vallado |first=David A. |year=2007 |publisher=Microcosm Press |location=Hawthorne, CA  |pages=31|oclc=263448232}}
</ref><ref name="smad"/>{{rp|121}} This orbital period, T, is directly related to the semi-major axis of the orbit through the formula:

: <math>T = 2\pi\sqrt{a^3 \over \mu}</math>

where:
: {{mvar|a}} is the length of the orbit's semi-major axis
: <math>\mu</math> is the [[standard gravitational parameter]] of the central body<ref name="smad"/>{{rp|137}}