I agree with this (see: my post below).  It&#x27;s probably a case of &quot;we&#x27;re sending a probe, would you like to put a telescope on it or have nothing at all&quot;.  I edited that I mean geosynchronous <i>lunar</i> orbit in particular.<p>If the target is in the plane of the ecliptic then the period of observation is probably not a full 28 days - for roughly half of that period a target would be eclipsed by the moon, plus some change for the Earth.  I have no idea the precise time this would be better or worse than the Earth given the Moon&#x27;s lack of magnetosphere or atmosphere pushing the drag down and decreasing the orbital radius vs the smaller angular view of the moon and so on.  It&#x27;s still probably longer than the Earth&#x27;s when comparing the radii equivalently, I&#x27;d think.  It&#x27;s 28x and change for sure, but with significant confounding factors.<p>Counterpoint:  the Moon has near-trivial gravity, so getting to lunar orbit isn&#x27;t much of a problem.  <i>Assuming</i> we had a moonbase, we could service lunar-orbital telescopes very easily.  Remember, lunar orbit was attained by the Apollo LEM, compared to a S-V to get off the terrestrial surface.  The rocket equation is a bitch, and strong gravity wells suck ass.