This year, there's a Full Moon on the day of the Autumn Equinox.
Very pleasing symmetry.
(Facebook folks click 'View original post' for the pic.)
Once every 19 years
Only a few more chances to view this Autumn Equinox/Lunar arrangement before we reach the halfway point in this precessional cycle: 2029, then 2048, 2067 and finally 2086