Here’s a topical question: do you think the Festival of the Unconquered Sun is celebrated on December 21/22 (or whenever the Terran Winter Solstice has moved to by ‘now’ in BT), or is it celebrated on the local Winter Solstice of each world? The latter makes more sense to me, not only because it makes more sense to not end up celebrating a winter festival during what might be local summer, but also because it allows a clear break with Christmas and keeps the two faiths from arguin about whose holiday it is.