The winter is upon us, and today is the winter solstice. This is the time when the sun appears at noon at its lowest altitude above the horizon. In the Northern Hemisphere this is the time at which the Sun is at its southernmost point in the sky. The solstice usually occurs on December 21 or 22 each year.
The winter solstice coincides with the shortest day and longest night of the year. Interpretation of the event has varied from culture to culture, but many cultures have held festivals, gatherings, rituals or other celebrations around that time.
The tilt of Earth as the Earth follows its orbit around the Sun, the same hemisphere that faced away from the Sun, experiencing winter, will, in half a year, face towards the Sun and experience summer. Since the two hemispheres face opposite directions along the planetary pole, as one polar hemisphere experiences winter, the other experiences summer.
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