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Winter solstice 2017

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In 2017 winter will begin on Thursday 21st of December at 16:28 UTC. This season will last 89 days and it will end on 20th of March with the beginning of spring.
The beginning of seasons is conventionally established by particular positions of the Earth during its orbit around the Sun. So the winter solstice occurs when the Sun reaches its greatest height south, i.e. the declination is -23º 27′ for the northern hemisphere. In the southern hemisphere summer begins.
Solstice is derived from the latin words sol (sun) and sistere (to stand still).