Summer came a day early this year
Summer came a day early this year, News & Observer, June 21, 2012. Though June 21 often marks the official start of summer, occasionally it falls on the 20th, as happened this year. The start of summer is determined by the solstice, the exact time when the northern half of the Earth is most tilted toward the sun, resulting in the longest day of the year in the Northern Hemisphere. Dr. Stephen Reynolds, physics, featured.
