First Day of Spring 2011
First Day of Spring 2011: The first day of spring is the day of the year when the Sun crosses the celestial equator moving northward. This day is known as the Vernal Equinox. Sunday, March 20, 2011 marks of the first day of spring 2011.
At 7:21 p.m. EST astronomical spring begins in the Northern Hemisphere as defined by International Astronomical Union, though it marks the beginning of fall for those in the Southern Hemisphere. On the vernal equinox, day and night are nearly identical in length 12 hours each at the equatorial plane.
An equinox occurs twice a year, in March and September, when the center of the Sun crosses directly over the Earth's equator, as the Earth is tilted neither away nor toward the Sun. Many cultures around the world celebrate the equinoxes as special occasions.
Are you ready to celebrate the First Day of Spring 2011?
At 7:21 p.m. EST astronomical spring begins in the Northern Hemisphere as defined by International Astronomical Union, though it marks the beginning of fall for those in the Southern Hemisphere. On the vernal equinox, day and night are nearly identical in length 12 hours each at the equatorial plane.
An equinox occurs twice a year, in March and September, when the center of the Sun crosses directly over the Earth's equator, as the Earth is tilted neither away nor toward the Sun. Many cultures around the world celebrate the equinoxes as special occasions.Are you ready to celebrate the First Day of Spring 2011?
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