Summer officially began in the Northern Hemisphere today (June 21), marking the longest day of the year.
During the June solstice (or summer solstice), the sun reaches its highest and northernmost points in the sky. Delivering the maximum daylight hours of the year for the Northern Hemisphere and minimum daylight hours of the year in the Southern Hemisphere, according to Chris Vaughan, amateur astronomer with SkySafari Software who oversees Space.com's Night Sky calendar.
This year, the summer solstice officially occurred at 10:57 a.m. EDT (14:57 GMT), when the sun reaches a point directly overhead of the Tropic of Cancer (latitude 23.5 degrees north).
Source: www.space.com
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