From: G&P
Message: 59275
Date: 2008-06-17
> But the solstice always
and by definition falls on ca. 21
> December.
Actually, it moves. That’s the “precession of the equinoxes”. It’s due to the wobble of the earth around its axis, like a coin spinning on a table. The solstice can be (at least) on the 20th, 21st, or 22nd.
Peter