Board Thread:Speculation House/@comment-6490434-20130410061505/@comment-10390252-20150715060621

Shadow at Morning wrote:

The rotation of the moon might also give us interesting information, considering it's not yet tidally locked. This would give an upper bound on the age of Remnant's moon, though calculation would be difficult, as many things are not known. Depending on the forces involved, the moon could have had its rotional period altered by the shattering event. So, it may have originally been tidally locked but as now been knocked out of that equalibrium.

Oddly enough, it might not rotate completely from the perspective of people on Remnant. if its rotational period is just a few days longer or shorter than its orbital period, it may seem to 'rock' back and forth, briefly exposing a normally-hidden hemesphire before turning back the other way.