The full moon closest to the autumn equinox is known as the Harvest Moon. Due to the tilt of the earth's axis, it rises an hour earlier than normal, giving on clear nights a near unbroken period of light. For those rural people working desperately into the night to bring the harvest home, this extra light was a godsend. The moon also often has a rich golden colour, reminiscent of ripened corn.
A relic of how important harvest was, and still is, to our survival, this is often the one full moon that nearly everybody knows.