Pull the tide The Black Keys, Spoon, Owen Pallett, Beck, Sharon Van Etten
The full moon cycle
is the period between alignments of the lunar perigee with the sun and
the earth, which is about 13.9443 synodic months (about 411.8 days).
Thus approximately every 14th full moon will be a supermoon. However,
halfway through the cycle the full moon will be close to apogee, and the
new moons immediately before and after can be supermoons. Thus there
may be as many as three supermoons per full moon cycle.