Summer?????

Question

What day does summer begin exactly

Answer 1

the day school gets out!!!! lol

Answer 2

around June 21

Answer 3

Based on astronomy, summer begins on the day of the summer solstice and ends on the day of the autumn equinox.

More technically, at an equinox, the Sun is at one of two opposite points on the celestial sphere where the celestial equator (i.e. declination 0) and ecliptic intersect. These points of intersection are called equinoctial points—the vernal point and the autumnal point. By extension, the term equinox may be used to denote an equinoctial point.

There is either an equinox (autumn and spring) or a solstice (summer and winter) on approximately the 21st day of the last month of every quarter of the calendar year. On a day which has an equinox, the center of the Sun will spend a nearly equal amount of time above and below the horizon at every location on Earth and night and day will be of nearly the same length. The word equinox derives from the Latin words aequus (equal) and nox (night).

For the year 2008  summer in the United States starts EXACTLY on  June 20, 2008 at 23:59hrs.

Please check this link for more information:

http://en.wikipedia.org/wiki/Equinox

Alvin