Editing Satellite constellation (section)

==Orbital shell==
In [[spaceflight]], an '''orbital shell''' is a set of [[artificial satellite]]s in [[circular orbit|circular]] [[orbit]]s at a certain fixed [[orbital altitude|altitude]].<ref name="fcc20181108b">[https://fcc.report/IBFS/SAT-MOD-20181108-00083/1569860 SPACEX NON-GEOSTATIONARY SATELLITE SYSTEM, Attachment A, TECHNICAL INFORMATION TO SUPPLEMENT SCHEDULE S], US Federal Communications Commission, 8 November 2018, accessed 19 November 2019.</ref> In the design of satellite constellations, an orbital shell usually refers to a collection of circular [[orbit]]s with the same [[orbital altitude|altitude]] and, oftentimes, [[orbital inclination]], 
distributed evenly in [[celestial longitude]] (and [[mean anomaly]]).{{citation needed|date=November 2019}} 
For a sufficiently high inclination and altitude the orbital shell [[pass (spaceflight)|covers]] the entire orbited body. In other cases the coverage extends up to a certain maximum [[latitude]].{{citation needed|date=November 2019}}

Several existing satellite constellations typically use a single orbital shell. New large [[megaconstellation]]s have been proposed that consist of multiple orbital shells.<ref name=fcc20181108b/><ref>{{Cite web|url=https://spacenews.com/amazon-lays-out-constellation-service-goals-deployment-and-deorbit-plans-to-fcc/|title=Amazon lays out constellation service goals, deployment and deorbit plans to FCC|date=2019-07-08|website=SpaceNews.com|language=en-US|access-date=2019-11-22}}</ref>