That’s because Earth takes slightly longer than a calendar year — 365 days, 6 hours and 9 minutes, to be exact — to complete one full orbit around the sun. Last year, the autumnal equinox ...

That’s because on the equinox, day and night last almost the same amount ... away from the sun, kick off summer and winter. The "Harvest Moon" is the full moon closest to the autumnal equinox.