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Astronomy Study Guide 3
Astronomy Study Guide
26
Science
7th Grade
01/19/2009

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Cards

Term
Rotation
Definition
The spinning motion of a planet about it's axis
Term
Revolution
Definition
The movement of an object around another object
Term
Gravity
Definition
the force of attraction between all masses in the universe
Term
Inertia
Definition
Inertia is the resistance an object has to a change in its state of motion
Term
Ellipse
Definition
A distorted circle
Term
Orbit
Definition
the path described by one celestial body in its revolution about another
Term
Indirect Rays
Definition
Rays from a light source that do not directly hit the object
Term
Direct Rays
Definition
Rays from a light source that directly hit the object
Term
Intensity
Definition
the amount of energy transmitted
Term
Year
Definition
a period of time containing 365 or 366 days
Term
Day
Definition
time for Earth to make a complete rotation on its axis
Term
Axis
Definition
The imaginary line through a planet or other celestial objects.
Term
Geogentric
Definition
having the earth as the center of the solar system
Term
Heliocentric
Definition
having the Sun as the center of the solar system
Term
Waxing
Definition
When light sweeps right to left
Term
Waning
Definition
When dark sweeps right to light
Term
Tide
Definition
surging waves
Term
High Tide
Definition
the tide when the water is highest
Term
Low Tide
Definition
the tide when the water is lowest
Term
Spring Tide
Definition
The tide with the most variation in water level
Term
Neap Tide
Definition
tide with the smallest tidal range
Term
Eclipse
Definition
one celestial body obscures another
Term
Solar Eclipse
Definition
When the moon blocks out the sun
Term
Lunar Eclipse
Definition
When the earth blocks out the moon
Term
Umbra
Definition
a region of complete shadow resulting from total obstruction of light
Term
Penumbra
Definition
a fringe region of partial shadow around an umbra
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