Page 37 - POP UP BOOK
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A full moon is the lunar phase that occurs when the
Moon is completely illuminated as seen from the
Earth. This occurs when the moon is in opposition to
the Sun (when it is on the opposite side of the Earth
from the Sun; more precisely, when the ecliptic
longitudes of the Sun and Moon differ by 180
degrees).
[1] This means that the hemisphere of the Moon that
is facing the Earth (the near side) is almost fully
illuminated by the Sun and appears round (While
the far side is almost completely unliminated).
