Interesting facts about winter

The winter solstice marks the first day of winter. For people residing in the Northern Hemisphere, Tuesday, December 21, 2021, heralds the official arrival of winter (the Southern Hemisphere's winter solstice is on Sunday, June 20).

Though it's common to think of the winter solstice as an event that spans an entire day, it actually occurs for just a moment - specifically when a hemisphere is tilte...