Posted by: tpsciencefun | March 19, 2012

Why Has Spring Sprung?

With the start of another spring, one often hears questions such as, ” Why does spring start today” or “What is the Vernal Equinox” ?

The answer to these questions is really quite simple.  The reason spring has sprung is because on the first day of spring there are 12 hours of daylight and 12 hours of darkness at all latitudes.  Those in the Northern Hemisphere will celebrate the first day of spring while those in the Southern Hemisphere will celebrate fall.

The vernal equinox (also known as the spring equinox) marks the beginning of spring and the end of winter, again,  because  at this specific time  the length of day and the length of night are equal.  This only happens twice a  year, on an equinox.  The fall equinox is called the autumnal equinox.

soucese: http://www.ibtimes.com/articles/316337/20120319/when-spring-vernal-equinox-2012-end-winter.htm

http://www.washingtonpost.com/blogs/capital-weather-gang/post/spring-equinox-marks-the-official-end-of-winter-early-tuesday-morning/2012/03/19/gIQAaaYyMS_blog.html

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