What is happening Monday, Sept. 23? The Vernal Equinox. This is the time when the sun moves from the north side of the equator to the south. This is when days and nights are roughly equal. The exact time of this year’s equinox is 2:50 a.m. Central Time.

The Earth’s axis is tilted relative to the plane of our orbit around the sun. This means that for those of us in Houston, the sun is higher in the sky during the summer and lower in the winter. This is where our seasons come from. In this case, it is the start of fall.

We hope you will join us celebrating the annual changes of the Earth and the scientific mechanics behind them. Public night at the observatory is the first Friday each month, from sunset to 10 p.m. Check out the stars, planets and objects through our large telescopes: humbleisd.net/observatory.

Aaron Clevenson
Author: Aaron ClevensonEmail: This email address is being protected from spambots. You need JavaScript enabled to view it.
I am the observatory director at the Insperity Observatory in Humble ISD. I am also an adjunct astronomy professor at Lone Star College-Montgomery where I teach solar system astronomy and stars and galaxies astronomy. I am the author of the astronomy textbook, “Astronomy for Mere Mortals.” I am a past president of the North Houston Astronomy Club, and was the chair of Astronomy Day in Southeast Texas in 2015 and 2016. He is an observing program director with The Astronomical League, coordinates their Master Observer Progression Awards, and has authored six of their observing programs.

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