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" ... The cycle from new Moon to full Moon to new Moon again coincides with increases and decreases in... [+] apparent size as the Moon moves along its elliptical orbit. Because it moves faster at perigee and slower at apogee, but has a constant rate of rotation, we see slightly more than 50% of the Moon over the course of a lunar month: this is the phenomenon of lunar libration. When perigee and fullness coincide, we see a supermoon, but this changes over time with a 411 day period. ... "