Tomorrow at 12:19 pm MDT we in the Northern Hemisphere experience the autumnal equinox. At that moment the north and south poles of this planet are equidistant from the sun and we experience equal amounts of sunlight and darkness.
The autumnal equinox is when summer officially ends and autumn officially begins. Since the summer solstice three months ago, we have gotten increasing amounts of darkness each day until we reach the winter solstice some three months from now. Tomorrow we reach the halfway point in this process.
As we've already reported, autumn comes early here in the mountains at 6300 ft. elevation, something like three weeks ago. By now many of the aspen leaves have turned a pale yellow, and the hillside mountain maples are turning red. We've had rainy days with gray skies and cool nights too.
It's getting to be time to think about migrating southward soon.
