By Kelly Kizer Whitt
Relief from the heat of summer and long days baking in the sun is on its way. The Northern Hemisphere's fall equinox occurs on Sept. 22 at 6:54 P.M. PDT. The harvest moon—the full moon that comes closest to the equinox—is just two nights later, on Sept. 24 at 7:53 P.M. PDT. On this date, the moon is in the constellation Pisces.