<P> The full moon is the lunar phase when the Moon appears fully illuminated from Earth 's perspective . 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 ° ) . This means that the lunar hemisphere facing Earth -- the near side -- is completely sunlit and appears as a circular disk , while the far side is dark . The full moon occurs once roughly every month . </P>
<P> The full moon is the lunar phase when the Moon appears fully illuminated from Earth 's perspective . 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 ° ) . This means that the lunar hemisphere facing Earth -- the near side -- is completely sunlit and appears as a circular disk , while the far side is dark . The full moon occurs once roughly every month . </P>
about how often is a full moon observed from earth 's surface
about how often is a full moon observed from earth 's surface
once roughly every month
once roughly every month