Question: which is the longest and shortest day of the year?
Answer: In 2019, the December solstice comes on December 21 at 10:19 p.m. CST. That's on December 22 at 04:19 Universal Time (UTC). It's when the sun on our sky's dome reaches its farthest southward point for the year. At this solstice, the Northern Hemisphere has its shortest day and longest night of the year.