Something for Everyone: A Solstice, Tonight!

At 04:48 UTC tomorrow morning (or 21:48 tonight Eastern US time), the Earth's north polar axis will be tipped as far away from the Sun as it will be all year. This means the Sun will reach its most southern position on the sky. It also means we have the day with the least amount of daylight in it*, and the longest night. In other words, it's the winter solstice (or, out of respect for southern hemisphereans, the December solstice). I described this in some detail last year at this time, so if yo...