Solstice, strawberry moon mark summer's official arrival

Summer solstice
In this June 21, 2015, file photo, the sun rises as thousands of revelers gathered at the ancient stone circle Stonehenge to celebrate the Summer Solstice, the longest day of the year, near Salisbury, England. The solstice occurs Monday at 6:34 p.m. on the East Coast.
Tim Ireland | AP 2015