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Earth, Sun & Moon Study Guide
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What is a lunar eclipse?
The moon enters earth's umbra.
What is a solar eclipse?
When the moon is blocking the sunlight.
What occurs more often - a solar eclipse or a lunar eclipse?
a lunar eclipse
When does a lunar eclipse happen?
during the full moon phase
When does a solar eclipse happen?
during the new moon phase
What 3 objects are needed for an eclipse?
sun, earth, moon
What is perigee?
moon's orbit closest to the earth
What is apagee?
moon's orbit farthest from earth
How many days does it take for the moon to revolve around the Earth?
27
What is waning?
the moon gets smaller
What is waxing?
The moon gets bigger
Why don't we see the same amount of the moon each night?
b/c of revolution
Why does the moon shine?
b/c of the reflection of the sun
What's the difference between rotation and revolution?
Rotation-when a planet or moon turns all the way around or spins on its axis one time. Revolution -a planet or moon travels around the body it is orbiting 1x.
Tell two examples of apparent motion
1)airplane is moving but looks like houses are moving 2)riding in a car - trees seem to be rushing by you, but you are actually moving
Define apparent motion
Apparent motion is something that seems to be moving but it's not.
What would happen if the moon was only affected by the Earth's gravity and didn't have any motion of its own?
The moon would go straight into the earth.
Explain why weight & mass are not the same thing.
Weight is affected by gravity and mass is not
What is mass?
Mass is how much stuff is in an object
What is weight?
how much gravity pushes down on an object
What is force?
Push or Pull
Tell 2 factors that influence the gravitational force between 2 objects
1)the size of the object 2) distance b/w objects
Tell me 3 things about the first day of Fall
1)autumn equinox 2)equal day/night 3) September 22nd or 23rd
Tell me 3 things about the first day of Spring
1) vernal equinox 2) equal day & night 3)starts the 21st or 22nd of March
Tell 3 things about the first day of winter
1) the shortest day of the year 2)Dec 21st or 22nd, 3)winter solstice
Tell me 3 pieces of information about the first day of summer
1-the longest day of the year 2-June 20th or 21st, 3-summer solstice
Why do we get seasons on Earth?
b/c the earth is tilted, so when we rotate the sun reaches part of the earth causing summer and the other side causing winter
What is one revolution of the earth around the sun called?
a year
What is a day?
one rotation of the earth on its axis
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