A full moon is the lunar phase that occurs when the Moon is completely illuminated as seen from Earth. This occurs when Earth is located directly between the Sun and the Moon more exactly when the ecliptic longitudes of the Sun and Moon differ by 180 degrees. This means that the hemisphere of the Moon that is facing Earth the near side is almost fully illuminated by the Sun and appears round while the far side is almost completely unilluminated. On some occasions at the time of full moon there is also a lunar eclipse so the moon`s face appears reddish due to the rayleigh scattering of blue light in Earth`s atmosphere.
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