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Moon Phases/Tides

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by

Natosha Daniels

on 8 September 2014

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Transcript of Moon Phases/Tides

Moon Phases/Tides/Seasons
The appearance or shape of the Moon gradually changes through the course of a month. This is called the Lunar Cycle.

The Moon is not self-luminous! It reflects the light of the Sun.
The Moon circles the Earth approximately
once every 28 days or 1 month.
Why do we never see the DARK SIDE?
The moon rotates on its axis at the same pace as
it revolves around the Earth, so we always see the
same face of the moon.
New Moon
Not this new moon
New moon occurs when the moon is between the sun & the Earth.
The unlit side of the moon is facing the Earth.
First Quarter Moon
The First quarter moon occurs when the moon is halfway between new and full.

As seen from the Earth, half the moon’s disk is illuminated
Full Moon
The full moon occurs when the Moon & the Sun are on opposite sides of the Earth.
The lit side of the moon is facing Earth.
Third/Last Quarter
The Third or last quarter moon occurs
halfway
between the full moon & the new moon.
As seen from the Earth, half the moon’s disk is illuminated.
Cockroaches can
live for _____days
after their heads
have been cut off.
9 days!!!!
Phases of the Moon
Tides are periodic rises and falls of large bodies of water.

Tides are caused by the
gravitational interaction
between the
Earth
and the
Moon
TIDES
Spring tides
are especially
strong
tides

They occur when the Earth, the
Sun, and the Moon are in a line.

The gravitational forces of the Moon and the
Sun both contribute to the tides.

Spring tides
occur during the full moon and the new moon.
Neap tides
are especially
weak
tides.

They occur when the gravitational
forces of the Moon and the Sun are
perpendicular to one another
(or pulling at 90 degrees).

Neap tides occur during quarter moons
.
This is like tug of war, between you (the sun) and Me (the moon). Are you going to have more strength if I am pulling with you or against you?
Brain Break!
Seasons
Earth’s rotation
The Earth spins on its axis every 23 hours & 56 minutes. This causes us to experience
day
and
night.
Earth’s revolution
It takes the Earth
365.25
days (or rotations) to travel or revolve around the sun once.
The Earth’s orbit around the sun is NOT a perfect circle. It is an
ellipse.

Seasons ARE
NOT
caused by how close the Earth is to the sun.

Earth’s axis is tilted 23.5°.

This tilting is why we have SEASONS like fall, winter,
spring, summer.

The number of daylight hours is greater for the
hemisphere, or half of Earth, that is tilted toward the Sun.
SEASONS ARE A RESULT OF THE TILT OF THE
EARTH'S AXIS.
BRAIN BREAK!
Lets review..
Name that moon phase!
Solstices occur twice a year, when the Earth is tilted directly towards or away from the Sun.

Winter solstice
is the shortest day of the year. In the Northern Hemisphere. It occurs on December 21 and marks the beginning of winter.

The Summer Solstice is the longest day of the year. It occurs on June 21 and marks the beginning of summer.
What is a rotation?
Why do we have a leap year?
What causes tides?
Mrs. Daniels
2014/2015
Just so you know...
Waxing Crescent
The lit side of the moon begins to grow.
Waxing Gibbous
The lit side of the moon is growing bigger;
greater than a quarter moon but not yet full.
Waning Gibbous
The lit side of the moon is shrinking
Less than a full moon, but not yet 3rd quarter.
Waning Crescent
The lit side of the moon is shrinking.
Less than 3rd quarter, but not yet a new moon.
Brain Break
The gravitational attraction of the moon causes the oceans to bulge out in the direction of the moon.
Another bulge occurs on the opposite side, since the Earth is also being pulled toward the moon (and away from the water on the far side).
Since the earth is rotating while this is happening,
TWO
tides occur each day.
Equinox:
equal day and night (12 hours of day, 12 hours of night)
Autumnal Equinox 2013 = September 22
Vernal Equinox 2014 = March 20
http://astro.unl.edu/naap/lps/animations/lps.swf
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