September is a month of radical improvement in radio propagation conditions. On September 23, 2023, the Sun will be directly over the equator. This happens twice a year, in the spring and fall, and is called an “equinox.” The fall, or “autumnal,” equinox is the day on which the Sun will cross the equator, as it appears to travel from northern to southern skies. On this day, over much of the Earth, the hours of daylight are equal to the hours of darkness. Sunrise should take place at approximately 6 AM local time and the Sun should set around 6 PM local time, except at the high latitudes.
This results in an ionosphere of almost uniform characteristics over large areas of the world and is usually the
