Largest and smallest Full Moon in 2012

posted: 1760 days ago, on Friday, 2012 Nov 30 at 11:45
tags: astronomy, Moon, Kos Coronaios.

Images of the largest Full Moon this year, on May 5, and the smallest Full Moon, on November 28, don't allow one to compare the relative sizes of the lunar disc, but when put side-by-side, the size difference is remarkable:

Photos by Kos Coronaios

In it's loopy wobbly orbit around our planet, the Moon's apparent diameter changes in a complicated fashion (see the graph below). The angular size depends on the distance between the Earth and the Moon, including tiny effects due to libration.

The diagram below shows the phase of the Moon (as a percentage, 100% = Full Moon) versus angular diameter (in arcseconds). The values were generated using NASA's HORIZONS online tool.

The phase of the Moon (as a percentage, 100 = Full Moon) versus angular diameter (in arcseconds) varies in a complicated fashion, and depends on the distance between the Earth and the Moon (including tiny effects of libration)

nothing more to see. please move along.