Friday, September 23rd brings the Autumnal, or Fall, equinox. The exact moment of the equinox will be 9:06 Universal time or 5:06 am EDT in the Americas. At that moment the tilt of Earth's axis will cause the Sun's apparent position to glide across the equator into the southern hemisphere. The Fall equinox marks the beginning of the Fall season in the northern hemisphere and Spring south of the equator.
At the equinox of the seasons I always recommend that you observe sunrise or sunset and make a mental note of the Sun's position on your horizon. Do the same around the winter or summer solstice and compare your observations!
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