First Day of Winter is Tuesday, December 21, 2010
- The winter solstice marks the first day of the winter season. On this day, the northern half of the Earth is tilted furthest from the Sun, and the Northern Hemisphere experiences the longest night (or most hours of darkness) of the year. Typically recognized as December 21 in the Northern Hemisphere, it marks the first day of summer in the Southern Hemisphere.
In 2010, the equinoxes and solstices take place at:
| First Day of Spring (Vernal Equinox) | 1:32 p.m. ET | March 20 |
| First Day of Summer (Summer Solstice) | 7:28 a.m. ET | June 21 |
| First Day of Autumn (Autumnal Equinox) | 11:09 p.m. ET | September 22 |
| First Day of Winter (Winter Solstice) | 6:38 p.m. ET | December 21 |
In 2011, the equinoxes and solstices take place at:
| First Day of Spring (Vernal Equinox) | 2:21 p.m. ET | March 20 |
| First Day of Summer (Summer Solstice) | 8:16 a.m. ET | June 21 |
| First Day of Autumn (Autumnal Equinox) | 12:04 a.m. ET | September 23 |
| First Day of Winter (Winter Solstice) | 8:30 p.m. ET | December 21 |
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