http://skyeventsmanagement.com/
this seems to have a few numbers that have been referenced
June 21 - June Solstice. The June solstice occurs at 10:07 UTC. The North Pole of the earth will be tilted toward the Sun, which will have reached its northernmost position in the sky and will be directly over the Tropic of Cancer at 23.44 degrees north latitude. This is the first day of summer (summer solstice) in the Northern Hemisphere and the first day of winter (winter solstice) in the Southern Hemisphere.
not bad anon
BOOM!