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Say your goodbyes to warm weather and hello to sweater season.
Fall arrives Thursday.
The autumn equinox, when the sun's center crosses the equator, will happen tonight at 9:04 pm EST, marking the beginning of fall in the Northern Hemisphere.
Those living south of the equator will transition from winter to spring.
The first day of fall and spring are defined as equinoxes, while the start of summer and winter are labeled solstices.
First, according to the National Weather Service, when the Earth's axis is not titled toward, or away, from the sun, it allows for an equal amount of daylight and darkness, known as an equinox.
The length of a day following an equinox will typically be 12 hours and seven minutes near the equator.
But areas with 30 degrees latitude will have days that last 12 hours and 8 minutes, while 60-degree latitude results in 12 hours and 16 minutes.
During the autumn equinox, the Northern Hemisphere experiences the fastest loss of daylight, with places like Washington, D.C., expected to lose two minutes, 30 seconds of daylight per day.
CLICK HERE TO GET THE FOX NEWS APPHowever, as a result of a solstice, the Earth tilts up to 23.5 degrees, both near and away from the sun.
When the summer solstice occurs, the sun reaches its highest elevation over the Tropic of Cancer in the Northern Hemisphere, affecting countries like Mexico, the Bahamas, Egypt, Saudi Arabia, India and southern China.

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