In article ,
Mike Rhino wrote:
Mmm, yes, provided the orbit was sun-synchronous -- precesses once around
the primary per primary orbital period -- which requires a rather exact
match between the orbit characteristics and the primary's equatorial
bulge. I can't see that persisting for very long, however; the exact
match is not very stable.

Suppose that it isn't an exact match so that one day lasts 100 years...

It would have to be very close to an exact match to be even that good.
I'd class it as a remarkable and strictly temporary coincidence to have a
day/night cycle of more than a few primary years.
--
MOST launched 30 June; science observations running | Henry Spencer
since Oct; first surprises seen; papers pending. |