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Phases of the Moon

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jacob delapaz

on 22 April 2010

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Transcript of Phases of the Moon

Phases of the Moon By: jacob delapaz A lunar phase, or phase of the moon, is
how much light is illuminated on the
moon's surface accourding to the
abserver on Earth. The lunar phase varies as the moon orbits around
the Earth, accourding to the position relitive to the
Sun, Earth, and the moon. One half of the moon is always
illuminated by the Sun (except during a lunar eclipse) but the amount that is visible from Earth can vary from 0% to 100% depending on what time of year it is. A new moon occurs when the moon is positioned
right in between the Earth and the Sun. The three
objects are in complete alignment, the part of the moon
that is illuminated is on the back side, which cannot be
seen. When the moon is in its full moon phase
the Earth, moon, and the Sun are in complete
alignment just like in the new moon phase but
the moon is positioned on the opposite side of the
Earth so the illuminated portion is fully visible. During the first and third quarter phases, often called
half moon, the moon is at a 90 degree angle, in respect
to the Earth and the Sun, so we only see half of the surface
of the moon illuminated. After the new moon phase you get a the
waxing crescent phase because the portion
of the moon illuminated is less than half. After
the first quarter phase you get the waxing
gibbous phase because the amount of sunlight
hitting the surface of the moon is still increasing
but it isn't full but it's more than half. After the full moon the light illuminated
on the moon starts to decrease so the waning
gibbous phase starts because the moon isn't.
full anymore. Following the third quarter
phase the waning crescent phase starts because
the light illuminated is less than half. The moon
goes back to the new moon phase once it completes
its cycle and starts all over again. The End!!!
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