The June solstice is here occurring at 04:24 UTC / 12:24 EDT. It is that point were the sun reaches the northern most point directly over the Tropic of Cancer and begins traveling in the other direction.
solstice (n.) mid-13c., from Old French solstice (13c.), from Latin solstitium “point at which the sun seems to stand still,” especially the summer solstice, from sol “the sun” (from PIE root *sawel- “the sun”) + past participle stem of sistere “stand still, take a stand; to set, place, cause to stand,” from PIE *si-st-, reduplicated form of root *sta- “to stand, make or be firm.” In early use, Englished as sunstead (late Old English sunstede). – taken from one of my favorite websites Online Etymology Dictionary.
Oh and if you are in the area and can, take in a Stonehenge Tour. It would be a great day to do it and it is a big event, last year I think about 23,000 people were there.