First Day of Fall 2018: Today is Autumnal equinox; when does time change?

Cliffs at Pourville

Cliffs at Pourville

Errol McKinson

Oil on Canvas 24 x 24

Welcome to the first official day of fall.

The 2018 Autumnal equinox occurs Saturday, Sept. 22 at 8:54 p.m. CT.

Also called the September equinox, the Autumnal equinox marks the start of fall in the Northern Hemisphere and spring in the Southern Hemisphere. During the equinox, the sun crosses the Earth's celestial equator, an imaginary line dividing the Earth into the northern and southern hemispheres.

At equinox - a word which means "equal nights" - the sun's rays will be directly over the Equator as its path moves towards the Southern Hemisphere. On that day, the sun's hemispheres receive the sun's rays about equally, making day and night roughly even at 12 hours each.

After the equinox, the days start getting shorter and the night longer until the December solstice.

When does the time change?

Daylight Saving Times ends of Sunday, Nov. 4

and most people will move their clocks back one hour before going to bed on Saturday, Nov. 3.

Sunrise and sunset will be about 1 hour earlier on Nov. 4 than the day before, leaving more light in the morning.

Daylight Saving Time in the U.S. starts on the second Sunday in March and ends on the first Sunday in November. The current schedule was introduced in 2007 as part of the Energy Policy Act of 2005.



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