The full moon of Friday, Sept. 13 is followed by the autumnal equinox—a day with equal amounts of daylight and darkness—on Monday, Sept. 23. Traditionally, the equinox marks the calendar beginning of fall, though we have seen many seasonal changes already, with acorn-laden oaks and buckeye leave

You've reached subscriber-only content

Free 3-day trial

Already a subscriber? Log in here.