Today is


The First Day of Autumn.  Maybe.  There are some sites that suggest it starts tomorrow.

But I'm going to trust the U.S. Government (Tea Partiers feel free to object). 
The spring equinox marks the first day of the spring season. On this day, the Sun is directly over the earth's equator, and daylight lasts 12 hours in the Northern Hemisphere and increasing. This day is typically recognized as March 21 in the Northern Hemisphere, and marks the first day of autumn in the Southern Hemisphere.
 The summer solstice marks the first day of the summer season. On this day, the northern half of the Earth is tilted closest toward the Sun, and the Northern Hemisphere experiences the longest day (or most hours of daylight) of the year. This day is typically recognized as June 21 in the Northern Hemisphere, and marks the first day of winter in the Southern Hemisphere.

The autumnal equinox marks the first day of the fall season. On this day, the Sun is again directly over the earth's equator, and daylight lasts 12 hours in the Northern Hemisphere and decreasing. This day is typically recognized as September 22 in the Northern Hemisphere. In the Southern Hemisphere, the first day of spring is recognized on September 23.

The winter solstice marks the first day of the winter season. On this day, the northern half of the Earth is tilted furthest from the Sun, and the Northern Hemisphere experiences the longest night (or most hours of darkness) of the year. This day is typically recognized as December 21 in the Northern Hemisphere, and marks the first day of summer in the Southern Hemisphere.

In 2010, the equinoxes and solstices take place at:

First Day of Spring (Vernal Equinox) 1:32 p.m. ET March 20
First Day of Summer (Summer Solstice) 7:28 a.m. ET June 21
First Day of Autumn (Autumnal Equinox) 11:09 p.m. ET September 22
First Day of Winter (Winter Solstice) 6:38 p.m. ET December 21

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