The 21st day of March represents the first day of spring in the northern hemisphere The tilt of the Earth's axis is inclined neither away from nor towards the sun, so the sun is vertically above a point on the Equator. It is a time when there is exactly twelve hours of daylight and twelve hours of darkness in a day at every location on earth.
Although the spring equinox is rarely celebrated by people in Europe it is a major celebration in Iran as
Nowruz, or the Persian new year, according to the solar calendar.
Posted: Sun Mar 21, 2010 9:23 am 