Welcome to 'equinox'

On Wednesday, Sept. 18, summer still had a few more days to hang around before caving in to the fall season that kicks in on Monday, Sept. 23. It left its final summertime calling card on Wednesday morning, the first frost of the season.

The targets were rooftops and motor vehicles. Windshields needed some attention with ice scrapers. The morning low in some area communities dipped down to 34 degrees or lower. It was a wake-up call of what lies ahead.

The autumnal equinox—also called the September or fall equinox—is the astronomical start of fall in the Northern Hemisphere and of spring in the Southern Hemisphere.

As summer hung around for its final day on Sunday, the temperature hit 82 degrees in the afternoon and it was up even more on Monday, the first day of fall at 85. High school football teams got to enjoy the heat on Saturday.

What is an Equinox?

The word “equinox” comes from Latin Equuleus, meaning “equal,” and box, “night.” On the equinox, day and night are roughly equal in terms of length.

During the equinox, the Sun crosses what is called the “celestial equator”—an imaginary extension into space of Earth’s equator line. The equinox occurs precisely when the Sun’s center passes through this line. When the Sun crosses the equator from north to south, this marks the autumnal equinox; when it crosses from south to north, this marks the vernal equinox.

After the autumnal equinox, nights begin to grow longer than the days. This ends with the December solstice, when days start to grow longer and nights shorter.

Week in Review

Date High Low Precis.

Sept. 18 63 42 0.00

Sept. 19 66 34 0.00

Sept. 20 72 40 0.00

Se[t 21 82 47 0.00

Sept. 22 82 54 0.00

Sept. 23 77 64 0.06

Sept. 24 71 59 0.00

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