June 21 is the summer solstice in the Northern Hemisphere and the winter solstice in the Southern Hemisphere. It has the most hours of daylight in the Northern Hemisphere and the fewest hours of daylight in the Southern Hemisphere. The Northern Hemisphere is tilted towards the sun and the sun sheds light directly on the Tropic of Cancer on June 21. The annular phase of a rare solstice solar eclipse is visible from parts of Africa and Asia,
Astronomical summer begins at the summer solstice, which is the longest day of the year. This means days get shorter during summer—very slowly at first, but at larger intervals as the September equinox approaches, heralding the start of Autumn.
Light a candle to celebrate Summer Solstice
It was also Fathers Day 18 June!