It's an astronomical event, it's day of festivity since antiquity and and international day. How much do you really know about it? Let's put your knowledge to the test ...
Answer: New York
More information: The International Day of Happiness was launched in 2013 by Ndaba Mandela, the late Nelson Mandela's grandson and Chelsea Clinton, daughter of Bill and Hillary Clinton, at the TedXTeen conference in New York City.
More information: Vernal Equinox Day is a national holiday in Japan, which is marked by visiting the grave sites of relatives and holding family reunions.
More information: Under resolution 66/281, the General Assembly of the United Nations officially proclaimed 20 March the International Day of Happiness on 12 July 2012.
Answer: March Equinox
More information: Though there are variations, the March equinox generally occurs on 20 March, with International Happiness Day adopting this date due to that event.
More information: Easter is traditionally celebrated on the Sunday after the first full moon that occurs on or after the March equinox.
More information: The sun travels northward across the equator (from south to north) during the March equinox, while it does the opposite during its autumnal counterpart.
Answer: Ban Ki-Moon
More information: Korea's Ban Ki-moon was Secretary-General of the United Nations from 2007 to 2016 and strongly supported International Happiness Day during its inception.
More information: Currently, the sun appears to be within the constellation Pisces during the vernal equinox. However, due to shifts in the Earth's axis this changes every few thousand years, so in 2597 during the March equinox, it will instead appear to be part of Aquarius.
More information: This resolution was put forth by the Kingdom of Bhutan, a landlocked country located in South Asia.
More information: The March equinox is known as Nowruz in some parts of Europe and Asia and marks the beginning of the calendar year, specifically in places like Iran.