Summer Solstice of 2015

Based on astronomical calculations, marks the date on Sunday 21/06/2015 the summer solstice in the northern hemisphere so that the sun is completely vertical on the Tropic of Cancer and is the farthest point reached by the sun in the "virtual" journey between the orbits of Capricorn and Cancer, so that the Day Sunday is the first day of summer astronomer and be the longest day and the night can be as short as possible in the northern half of the globe, knowing that just the opposite is happening in the southern part of the globe, where the start of winter and the longest night as possible.