The summer solstice occurs exactly when the axial tilt of a planet's semi-axis in a given hemisphere is most inclined towards the star that it orbits. Earth's maximum axial tilt to our star, the Sun, during a solstice is 23? 26'. This happens twice each year, at which times the Sun reaches its highest position in the sky as seen from the North or South Pole respectively. (more from wikipedia).
Summer solstice 2012: Longest day of year - how does daylight ...
If you've enjoyed these bright, sun-filled evenings for an outdoor barbecue or a neighborhood stroll, the summer solstice tonight marks the culmination of our ...
(more from www.washingtonpost.com).
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