Since the days are getting shorter and colder, it seems that winter has been us for many weeks. However though meteorologists in the Northern Hemisphere consider December 1 as the start of winter according to the space or astronomical calendar, the season will not begin until December 21. Often mentioned as the winter solstice , it is also the shortest day and longest night of the year.people who live in the Southern Hemisphere, will celebrate their summer solstice, the start of the astronomical summer, which will be the longest day and shortest night of 2018.
The unlike seasons are a result of the earth’s rotation around the sun and its own axis, which is tilted at a 23.5 angle. The winter solstice marks the time of year when the Northern Hemisphere faces away from the sun, receiving way more less sunlight than the Southern Hemisphere, which is towards the sun . The date of the solstice differ between December 20 to 23 because our calendar has 365 days, with an extra “leap” day and does not correspond exactly with the solar year, which lasts 365.2422 day
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