Full Moon occurs on the 12th at 5:27 am Eastern daylight Time. Since this Full Moon falls closest to the autumnal equinox it is almost universally known as the Harvest Moon. This tradition comes down to us from farmers in Medieval Europe, who took advantage of the unusual geometry of the Moon’s orbit and their high northerly latitude to help them bring in their crops for the winter. At this time of the year the Moon’s orbit intersects the eastern horizon at a shallow angle for Northern Hemisphere observers. The farther north you go, the shallower the angle appears. The net effect of this is that over the course of several nights around the time of the Full Moon Luna appears to rise just a few minutes later on consecutive nights. Most of the U.S. the difference is between 25 to 35 minutes later on successive nights, but in northern Europe the difference is only 10 minutes per night. In the Nordic countries above 62 degrees north latitude the Moon actually rises earlier on successive nights around the time of Full Moon. The "extra" light provided by the rising Moon thus allowed farmers to work well past sunset to harvest their fields, thus giving this particular Full Moon its very appropriate name in sky lore.