Today marks the first day of spring in the Northern Hemisphere, and is marked by the equinox.
Online, the event has been marked with a Google Doodle.
The spring equinox is significant because after a long and dark winter, the hours of day and night are equal for the first time this year – about 12 hours each.
1/46 Google Doodle celebrating Fazlur Rahman Khan
Google Doodle celebrating Fazlur Rahman Khan
2/46 Google Doodle celebrating Sergei Diaghilev
Google Doodle celebrating Sergei Diaghilev
3/46 Google Doodle celebrating St. Patrick's Day
Google Doodle celebrating St. Patrick's Day
4/46 Google Doodle celebrating Holi Festival
Google Doodle celebrating Holi Festival
5/46 Google Doodle celebrating St. David's Day
Google Doodle celebrating St. David's Day
6/46 Abdul Sattar Edhi
Google Doodle of Abdul Sattar Edhi on February 28 2017
7/46 Seven earth-sized exoplanets discovered
Google Doodle celebrates Nasa's discovery of seven earth-sized exoplanets in new solar system
8/46 Bessie Coleman
Google Doodle honours the first African American woman to get an international pilot licence on her 125th birthday
Google Doodle celebrates Christmas caroling
Today's Google Doodle features activist Steve Biko
11/46 Walter Cronkite
Google celebrates Walter Cronkite's 100th birthday
12/46 Ladislao José Biro
Google celebrates Ladislao José Biro 117th birthday
Google celebrates its 18th birthday
14/46 The history of tea in Britain
Google celebrates the 385th anniversary of tea in the UK
15/46 Autumnal equinox 2016
Google marks the start of fall
16/46 Paralympics 2016
Google marks the start of the Paralympic Games 2016
17/46 Nettie Stevens
Google celebrates Nettie Stevens 155th birthday
18/46 Father's Day 2016
Google celebrates Father's Day
19/46 Elizabeth Garrett Anderson
Google celebrates Elizabeth Garrett Anderson 180th birthday
20/46 Earth Day 2016
Google celebrates Earth Day
21/46 Ravi Shankar
Google marks Pandit Ravi Shankar's 96th birthday
22/46 Olympic Games in 1896
Google are celebrates the 120th anniversary of the modern Olympic Games in 1896
23/46 World Twenty20 final
Google celebrates the 2016 World Twenty20 cricket final between the West Indies and England with a doodle
24/46 William Morris
Google celebrates William Morris' 182 birthday with a doodle showcasing his most famous designs
25/46 St Patrick's Day 2016
Googlle celebrates St Patrick's Day on 17 March
26/46 Caroline Herschel
Google marks Caroline Herschel's 266th birthday
27/46 Clara Rockmore
Google celebrates Clara Rockmore's 105th birthday
28/46 International Women's Day 2016
#OneDayIWill video marks International Woman's Day on 8 March
29/46 St David's Day 2016
Google marks St David's Day
30/46 Leap Year 2016
Google celebrates Leap Day on 28 February 2
31/46 Lantern Festival 2016
Google celebrates the last day of the Chinese New Year celebrations with a doodle of the Lantern Festival
32/46 Stethoscope Inventor, René Laennec
Google celebrate's René Laennec's 235th birthday
33/46 Valentine's Day 2016
Google celebrates Valentine's Day with a romantic Doodle
34/46 Dmitri Mendeleev
Google celebrate Dmitri Mendeleev's 182nd birthday
35/46 "The televisor" demonstartion
Google Doodle celebrates 90 years since the first demonstration of television or "the televisor" to the public
36/46 Professor Scoville
Google marks Professor Scoville’s 151st birthday
37/46 Sophie Taeuber-Arp
Google marks Sophie Taeuber-Arp's 127th birthday
38/46 Charles Perrault
Google celebrates author Charles Perrault's 388th birthday
39/46 Mountain of Butterflies discovery
Google celebrates the 41st anniversary of the discovery of the Mountain of Butterflies
40/46 Winter Solstice 2015
Google celebrate the Winter Solstice
41/46 St Andrew's Day 2015
Google marks St Andrew's Day with doodle featuring Scotland's flag and Loch Ness monster
42/46 41st anniversary of the discovery of 'Lucy'
Google marks the 41st anniversary of the discovery of 'Lucy', the name given to a collection of fossilised bones that once made up the skeleton of a hominid from the Australopithecus afarensis species, who lived in Ethiopia 3.2 million years ago
43/46 George Boole
Google marks George Boole's 200th birthday
44/46 Halloween 2015
Google celebrates Halloween using an interactive doodle game "Global Candy Cup"
45/46 Prague Astronomical Clock
Google celebrates the 605th anniversary of the Prague Astronomical Clock, one of the oldest functioning timepieces in the world
46/46 Autumnal Equinox 2015
Google marks the autumnal equinox on 23 September
And as with each change in the season, there are rituals and traditions which accompany it.
Read on for The Independent’s guide to the Spring equinox.
What is Ostara?
Ostara is the name given by Pagans and Wiccans to the spring equinox and is one of the eight ‘sabbats’ – periods they believe make up the year.
Some observers believe the event is a revival of ancient celebrations of spring, which merged into Easter after the spread of Christianity in the British Isles.
When is daylight savings?
In the UK the clocks will ‘spring forward’ on Sunday, 26 March at 1am.
Can you balance an egg?
This unusual question stems from the urban myth that it is possible to stand an egg on its end during the first day of spring. Proponents say this is because of a unique gravitational pull which occurs at this time of year.
But this is untrue. There is no change to the Earth’s gravitational pull during the spring equinox – or any other day. It is possible to balance an egg on its end, but, with the right know how, this is possible any time of the year.
What happens on the vernal equinox?
The vernal equinox is the astrological name for the spring equinox. It marks the moment the sun crosses the equator from south to north. It occurred at 10.29 GMT.
What is the solstice?
The equinox differs from the solstices, which occur twice yearly to mark the sun’s most northern or southern position relative to the equator.Reuse content