The summer solstice in the northern hemisphere occurs annually on June 21 and is the time at which the sun is at its northernmost point in the sky.
The summer solstice is the longest day of the year, and marks the time when the sun is the at its most northern position.
It also marks the shortest night of the year also, at least for people in the Northern hemisphere.
For those in the southern hemisphere, the longest day of the year will come in December. Today, however is the winter solstice for those in the south.
For some it may mean nothing. But the day is annotated with a number of pagan celebrations around the world.
Stonehenge was supposedly built for this purpose, and some people still go there to celebrate today.
An average of 30,000 people, mostly neo-pagan groups, flock to Stonehenge for the celebration