Winter Solstice, Dec 22--the shortest day of the year.

Now the days will be gradually getting longer, which means spring is on its way!

Shortest day of the year: When is winter solstice 2015 and why is it a day later this year? https://t.co/7eVVkpAyda

— Neil (@nizzlesquizzle) December 21, 2015

This Week's Night Sky: Winter Solstice and a Christmas Moon https://t.co/LofB7zBIBi

— Nat Geo Channel (@NatGeoChannel) December 22, 2015

Tonight marks the winter solstice in the Northern Hemisphere. What does it really mean? https://t.co/UII9PabBkq

— National Geographic (@NatGeo) December 21, 2015