Banff National http_%2F%2Fcdn.cnn.com%2Fcnnnext%2Fdam%2Fassets%2F180920102505-06-fall-equinox-2018-restricted.jpgBanff National Park, Canada: A full moon rises over Vermilion Lakes. The full moon closest to the fall equinox is often called the harvest moon, and in 2018, it can be seen on September 25 at 2:55 UT (that's 10:55 p.m. ET September 24 in the United States.)