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dhani — June 14, 2007 / 10:46 pm
Summer Solstice for this year will occur on June 21st, 18:06 UT (GMT). This event marked season change from spring to summer in northern hemisphere and autumn to winter in southern hemisphere.
Solstice, from the Latin for sun stands still, in astronomy, either of the two points on the ecliptic that lie midway between the equinoxes — when Sun crosses the celestial equator (i.e., declination 0). At the solstices the sun’s apparent position on the celestial sphere reaches its greatest distance above or below the celestial equator.
At the time of summer solstice, the sun is directly overhead at noon at the Tropic of Cancer — the latitude of 23° 27’ North, so named because the constellation corresponding to this position in the sky was Cancer when the constellations were named nearly 2000 years ago. However, precession effect has resulted in a shift of the position of the Sun so that it is now in the constellation Gemini on the summer solstice.
On Northern Hemisphere, summer solstice marked the longest day of the year, respectively, in the sense that the length of time elapsed between sunrise and sunset on this day is a maximum for the year.
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