When is the summer solstice? - MSN Astronomical summer starts at the summer solstice and ends at the fall equinox — usually around Sept 22 or 23 Astronomical seasons are based on the position of the Earth in relation to the sun
15 Facts About the Summer Solstice - MSN The summer solstice is the longest day of the year in the Northern Hemisphere, so soak up some of those direct sunbeams (safely, of course) and celebrate the start of summer with these 15 facts
June 21 Summer Solstice: More Than Just the Longest Day - MSN The Science Behind the Sun's Zenith At its core, the summer solstice is a phenomenon of axial tilt Our Earth orbits the sun on a tilted axis, an inclination of approximately 23 5 degrees