The Winter solstice
The Sun reaches its furthest point south on 21 December.
At 1628 UTC today, 21 December, the Sun reaches its furthest southern extremity of 23º26.1'. Astronomically, this - the shortest day - is the start of Winter but, meteorologically, Winter comprises the months of December, January and February.
The Sun will return to the northern hemisphere at the Vernal equinox - 1615 UTC on 20 March 2018. It will reach its furthest north at the Summer solstice - 1007 UTC on 21 June 2018.
Clocks in Europe will go forward one hour at 0100 UTC on Sunday 25 March as Europe moves to Summer Time (EST and BST).
There are also 4 Quarter Days in the UK Legal Calendar:
- Christmas Day (25 December)
- Lady Day (25 March)
- Midsummer Day (24 June) and
- Michaelmas (29 September)
Further details from the link below . .