In article , 7
No because Earth is a slight doughnut shape with the bulge through the
equator, and the Moon is also orbiting around the equator which means
orbits other than equator are not stationary or stable.
IIUC In reality, none of the usual orbits are absolutely stable. Just that
some get closer than others. Even geostationary satellites tend to require
'stationkeeping' thrust burns and may drift away from their nominal
location when that is no longer possible. The usual circles and ellipses
are just a first approximation to real behaviour.
IIRC it is routine to 'park' geostationary sats elsewhere as they near the
end of the design life.
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