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When was the first day of spring 2009?

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May 14, 2009 4:06PM

Spring comes in between the 19th to the 23rd of March and at different times. It changes on a yearly basis because the first official day of spring is the (Spring) Vernal Equinox. This is when the sun is directly above the equator. It rises due East and sets due West and does not do so on the exact same day every year, since the calendar is not exactly 365 precise days every single year.

In 2009, spring arrived on March 20; the sun was above the equator, and crossed to the northern hemisphere at approximately 11:47p.m.

The first day of spring in the Northern Hemisphere this year (2009) was March 20. The equinox was at 5:48 GMT. In general, the four seasons correspond to the relative position of the sun to the earth. Meteorological determination of spring is calculated according to when the sun passes through the equatorial plane. When going from winter to spring, the sun is moving north; as soon as the sun crosses the equator, we call it spring. == == The above applies to places north of the equator.

"Spring", a time of melting and new growth, occurs about September-November in places south of the equator, e.g., Australia, New Zealand, Africa, Brazil...).

The official date of spring south of the equator (corresponding to the first official day of fall in places north of the equator) would be around September 20/21, depending on when the sun crosses the equator. Countries such as Australia and New Zealand, however, designate the first day of September as the official first day of spring.