June 21st (or 22nd) is the summer solstice for the northern hemisphere*.
Solstice in Latin means "sun standing still." On that day it seems
like the sun is standing still because there is more daylight than on any
other day. It is the first day of summer and a special day for many groups
of people.
Many ancient cultures had ceremonies on solstice. They celebrated light
and fire. Many people also thought it was a time for love and growth.
Nowadays many places around the world have parades or parties.
The great English writer, William Shakespeare, said** whatever you dream
on this night will come to pass. Have great dreams on June 21! And if you
are in the northern hemisphere, enjoy the longest day of the year.
* Summer solstice is on December 21 (or 22nd) in the southern
hemisphere. June 21 (or 22nd) is the southern hemisphere's Winter solstice.
** in his play A Midsummer's Night Dream

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