An imaginary line that passes through Earth's center and the North and South poles, about which the Earth rotates
What is axis?
100
a system of organizing time that defines the beginning, lengthm abd divisions of a year
What is calendar?
100
the first person to answer questions about the movement of the Earth
Who is Isaac Newton?
100
the phases of the moon, eclipses and tides are caused by this
What is the changing relative positions of the moon?
100
teh very darkest part of the moon's shadow
What is the umbra?
200
the spinning of the Earth on its axis
What is rotation?
200
when the sun is farthest North of the equator
What is solstice?
200
a push or a pull
What is force?
200
the different shapes of the moon that you see from Earth
What are phases?
200
the larger part of the shadow during an eclipse
What is penumbra?
300
Earth moves in space in these two ways
What is rotation and revolution?
300
when day and night are equal, about 12 hours long everywhere on Earth
What is equinox?
300
the force that attracts all objects toward each other
What is gravity?
300
the phase of the moon that you see depends on this
What is how much of the sunlight side of the moon faces Earth?
300
When Earth blocks sunlight from reaching the moon
What is a lunar eclipse?
400
the movement of one object around another
What is revolution?
400
The month and day each year that the vernal (Spring) equinox occurs
What is March 21?
400
every object in the universe attracts every other object in the univerese
What is the law of universal gravitation?
400
This occurs when the moon's shadow hits Earth or Earth's shawdow hits the moon
What is an eclipse?
400
differences in how mch the moon's gravity pulls on different parts of Earth causes these
What are tides?
500
the path that Earth follows as it revolves around the sun
What is orbit?
500
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Earth's axis is tilted as it revolves around the sun, which causes these
What are seasons?
500
the strength of the force of gravity between two objects depends on these two factors
What are the masses of the objects and the distance between them?
500
a solar eclipse occurs when this passes directly between the Earth and the sun, blocking sunlight from Earth
What is the moon?
500
a tide in which the least difference between consecutive low and high tides. It occurs twice a month.