Autumnal Equinox – Harvest Moon

It is 2010, (at least it is on the most common of Earth's calendars,) and this year the autumnal equinox and the harvest moon occurred within hours of each other. Calculating the sun's position relative to the earth, fall began on September 22 at 11:09 PM Eastern time and the moon became fully full (or if you wish to sound like a scientist, it achieved maximum illumination) within hours, early on September 23. It will be nineteen years before we come close to that again.