Did you know?

Summer Solstice is the day in a year when the Sun reaches its northernmost point in the planet Earth's sky.

June 21, 2011 - the date this year traditionally marks a change of seasons - from spring to summer in Earth's Northern Hemisphere and from fall to winter in Earth's Southern Hemisphere.

Summer solstice occurs on the longest day and the shortest night of the year in the northern hemisphere

Winter solstice occurs on the shortest day and longest night of the year. December 22 is the date for Winter solstice this year.

Thousands of people gather at sunrise at the ancient Stonehenge monument to see the sun rise through the 4,000 year old solar monument on Salisbury plain in southern England.

According to NASA, the Sun continues to rise over Stonehenge in an “astronomically significant way.”

NASA explains: Standing within Stonehenge, facing north-east through the entrance towards the heel stone, one can sees the sun rise above the stone at summer solstice.

Travellers

Travellers watch as the sunrises over the Stonehenge monument near Salisbury at a summer solstice on June 21.REUTERS/Paul Hackett