The 2019 autumnal (September) equinox occurs on Monday, Sept. 23 at 3:50 a.m. EDT, when the Sun is positioned directly over the Earth’s equator and moving south. In other words, the Earth’s rotational axis is perpendicular to the Sun.
Daylight is waning rapidly every day. In late September the Sun rises (due east) nearly one minute later every day, and the Sun sets (due west) about one-and-a-half minutes earlier every day. For East Tennessee sunrise will be at 7:24 a.m. and sunset will be at 7:31 p.m. The actual “equinox” or equal periods of day and night does not occur in this area until Sept. 26.
The animals sense autumn instinctively. It triggers mating in deer, migration in waterfowl and other birds, and hibernation activities in bears and groundhogs.