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The Longest Day

The Summer Solstice in the Northern Hemisphere

Otherwise put, when is the shortest night?

In the Northern Hemisphere the summer solstice occurs around June 21st. The opposite day, the shortest of the year, is the Winter Solstice , which occurs around 21 December each year.

In the Southern Hemisphere the respective dates are reversed, Winter Solstice occurs on the same day in June and Summer Solstice same day in December.

There are also two days in the year when the day and night are of equal duration. These are known as the Equinox days.

In the Northern Hemisphere the Vernal Equinox (Spring Equinox) occurs around March 21st whilst the Autumnal Equinox (Fall Equinox) occurs around September 21st each year.

Again in the Southern Hemisphere the respective dates are reversed.



Read here: Solstice and Stonehenge about a very special place in the UK, associated with the Summer Solstice and the sun.

Find below precise solstice and equinox dates and times for the Northern Hemisphere, from 2016 to 2020:

Longest day

Date & Time of Solstices & Equinoxes in 2016

  • Vernal Equinox (Spring) March 20 2016 04:30 GMT
  • Summer Solstice (Summer) June 20 2016 22:34 GMT
  • Autumnal Equinox (Fall) September 22 2016 14:21 GMT
  • Winter Solstice (Winter) December 21 2016 10:44 GMT

Date & Time of Solstices & Equinoxes in 2017

  • Vernal Equinox (Spring) March 20 2017 10:29 GMT
  • Summer Solstice (Summer) June 21 2017 04:24 GMT
  • Autumnal Equinox (Fall) September 22 2017 20:02 GMT
  • Winter Solstice (Winter) December 21 2017 16:28 GMT

Date & Time of Solstices & Equinoxes in 2018

  • Vernal Equinox (Spring) March 20 2018 16:15 GMT
  • Summer Solstice (Summer) June 21 2018 10:07 GMT
  • Autumnal Equinox (Fall) September 23 2018 01:54 GMT
  • Winter Solstice (Winter) December 21 2018 22:22 GMT

Date & Time of Solstices & Equinoxes in 2019

  • Vernal Equinox (Spring) March 20 2019 21:58 GMT
  • Summer Solstice (Summer) June 21 2019 15:54 GMT
  • Autumnal Equinox (Fall) September 23 2019 07:50 GMT
  • Winter Solstice (Winter) December 22 2019 04:19 GMT

Date & Time of Solstices & Equinoxes in 2020

  • Vernal Equinox (Spring) March 20 2020 03:49 GMT
  • Summer Solstice (Summer) June 20 2020 21:43 GMT
  • Autumnal Equinox (Fall) September 22 2020 13:30 GMT
  • Winter Solstice (Winter) December 21 2020 10:02 GMT

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