Tonight will mark the Summer Solstice. Astronomically, it looks like this:
The Summer Solstice occurs exactly when the Earth’s axial tilt is most inclined towards the sun at its maximum of 23° 26′. The seasonal significance of the Summer Solstice is in the reversal of the gradual shortening of nights and lengthening of days. That will occur on June 21st at 5:04 UTC (1:04am Eastern, 12:04am Central, 11:04pm June 20th Mountain and 10:04pm June 20th Pacific Time).
Tomorrow the sunrise (near where I live) will be 5:15am and sunset will be 8:29pm … 15 hours and 14 minutes of sunlight. On Winter Solstice, 6 loooong months ago, sunrise was at 7:15am and sunset was at 4:22pm, barely 9 hours of sunlight.
That is all the sciencey stuff. Of course, we know that there is more to it than that.