Duration: 5 min
KKUOR12A01
THE MOON
Grade: 8
PHYSICS
The Moon
 Moon is a celestial body
 Moon is a Non – luminous
object
 Moon reflects suns light
 Moon is not having its own
light
 The Moon is Earth's only
natural satellite
THE First
Astronomer
who HAD
visited the
moon is Neil
Arm strong
along with
the pilot
Edwin ALDRIN .
SURFACE OF THE
MOON
 The Moon’s surface is dusty and barren.
 There are many Craters of different sizes.
 It also has a large number of steep and high
mountains . Some of these are as high as the
highest mountains on the Earth.
 The moon has no Atmosphere and Water
however it has a plenty of Oxygen .
MOONS
SURFACE
MOONS MOTION
 The Moon rotational period is equal to its orbital period
 The Moon completes 1 rotation about its axis in the same
time as it completes 1 orbit around the earth
 The near side of the Moon is the lunar hemisphere that
always faces towards Earth, opposite to the far side. Only
one side of the Moon is visible from Earth because the Moon
rotates on its axis at the same rate that the Moon orbits the
Earth
Is Moon changing its Shape ?
The Moon doesn't emit light itself, the
‘Moonlight' we see is actually the
Sun's light reflected off the lunar
surface. So, as the Moon orbits the
Earth, the Sun lights up different
parts of it, making it seem as if the
Moon is changing shape.
So We can also say that sun is
responsible for the changes in moon
shape due to its light .
PHASES OF THE MOON
LUNAR
CYCLE
The Phases of the Moon
means the various shapes
of the moon during a month
in about 28 to 30 days .
New Moon Day
Related to phases of the moon
 “The New Moon Day is the day in
which the whole disc of the moon
is not visible “
 It occurs after 15 th day of the
month or at the 30 th day of the
month .
 Crescent moon will be formed
after the new moon day whereas
crescent moon means the small
portion of the moon which will be
visible after the new moon day
CRESCENT MOON
Why we cant see the moon on New Moon Day ?
 The Moon is between
Earth and the Sun.
So the side of the
Moon facing the Sun
isn't facing us.
We can't see any
portion of the litup Moon during this
phase where as no
Waxing Crescent Moon
 A waxing crescent moon
is when the moon is
similar to crescent and
the crescent increases
‘waxes’ in size from one
day to the next day.
However, this phase is
usually visible only in
the west.
First Quarter Moon
 The First Quarter
moon is also known as
a half-moon. This
phase of the moon is
visible when only half
of the portion of the
moon is visible that is
lit. This happens after
the occurrence of the
waxing crescent
phase. It arrives after a
week of the new moon.
Waxing Gibbous Moon
 A waxing gibbous moon
occurs when more than
half of the lit area of the
moon is visible and the
shape also increases. The
shape increases in size
from one day to the
upcoming day. The waxing
gibbous phase happens
between the first quarter
and the full moon phases.
RELATED TO PHASES OF THE MOON
FULL MOON
 “The Full Moon Day is the day in
which the whole disc of the moon
is visible “
 It occurs on the 15 th day of the
month .
 Waning Gibbous Moon will be
formed after the full moon day .
13
Waning Gibbous Moon
 A waning gibbous
moon occurs only
when more than
half of the lit
area of the moon
is visible. During
this, the shape
decreases in the
size from one day
to the upcoming
next day. The
Last Quarter Moon
 The last quarter
moon that we also
call as the halfmoon is when half
of the lit area of the
moon is visible after
the waning gibbous
phase of the moon.
Waning Crescent Moon
 A waning crescent
moon is when the
moon is similar to
the crescent. Here,
the crescent
decreases in the size
from one day to the
other day coming
next.
A day or two days after this phase , the New moon will
be new again and the lunar cycle continues .
So these are the Phases of the Moon
DONE BY S.SEETHARAMAN