Winter Solstice

The winter solstice, hiemal solstice or hibernal solstice, also known as midwinter, occurs when one of the Earth's poles has its maximum tilt away from the Sun.

It happens twice yearly, once in each hemisphere (Northern and Southern). For that hemisphere, the winter solstice is the day with the shortest period of daylight and longest night of the year, when the Sun is at its lowest daily maximum elevation in the sky.

At the pole, there is continuous darkness or twilight around the winter solstice. Its opposite is the summer solstice. via Wikipedia: Winter solstice

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