21 June 2009: Happy Summer Solstice, The Longest Day of The Year
If you've been waiting for the chance to get more done during the day, Sunday is your day, but only by a fraction of a second.More here.
Like a giant timepiece, Earth and sun are configured for the summer solstice once again. This year it happens June 21, the longest day of the year in the Northern Hemisphere. The sun will be up a fraction of a second longer than the day prior or the day after. (The length of the full day, including night, does not change, of course.)
To grasp how it works, one must understand Earth's cockeyed leanings and some celestial configurations that even the ancients knew something about.
Our planet is tilted 23.5 degrees on its spin axis. On June 21 this year (some years it's June 20), the North Pole is pointing toward the sun as much as is possible.
Image source: Wikipedia