Il 29 febbraio non ce lo siamo scordati vero !!!
Oggi 20 marzo ... è già Primavera. Un giorno prima !
...
http://it.wikipedia.org/wiki/Precessione_degli_equinozi
http://www.cosediscienza.it/tempo/06_ricerca.htm
http://leonardo.blog.rai.it/2012/03/19/puntata-di-lunedi-19-marzo-2012/
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Spring equinox Google doodle heralds change of season
http://www.guardian.co.uk/technology/2012/mar/20/spring-equinox-google-doodle
- 20 Mar 2012: Search engine puts Marimekko design on homepage to mark end of winter and beginning of spring in northern hemisphere
Search engine puts
Marimekko design on homepage to mark end of winter and beginning of spring in
northern hemisphere
Spring equinox celebrated in a Google doodle. Photograph: Screengrab
Spring equinox celebrated in a Google doodle. Photograph: Screengrab
Google marked the
vernal equinox, or the first day of Spring, using a doodle
based on a design by Marimekko,
the the Finnish textile company famous for its bright, bold prints.
Spring has
historically started on the day of the vernal equinox, which occurs on the
night of 20/21 March.
An equinox is one of
two times during the year when the length of day and the length of night are
just about equal while the word vernal comes from the Latin word for bloom. It
refers to the fact that this equinox marks the end of winter and the beginning
of spring in the northern hemisphere.
Astronomers have
defined an equinox as that moment when the sun arrives at one of two
intersection points of the ecliptic, the sun's path across the sky, and the
celestial equator, earth's equator projected onto the sky.
The date is
particularly significant for pagans, many of whom carry out rituals, while
others indulge in activities such as egg races, egg hunts and egg eating and
egg painting. A number of Spring harvest festivals are celebrated at this time
while Vernal Equinox Day is a national holiday in Japan, when families visit
graves and hold reunions.
The Persian new
year, Nowruz, also corresponds with the vernal equinox while many Iranians,
Kurds and others will celebrate the 13-day festival.
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