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26 Cards in this Set

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The rise and fall of water
Tide
When the sun is directly overhead at the equator

*March and December
Equinox
The study of the moon, stars, and other objects in space
Astronomy
The earth's path as the revolves around the sun
Orbit
One of the different shapes of the moon as seen fron earth.
Phase
Larger shadow around the umbra
Penumbra
Occurs at full moon when the earth is directly bettween the moon and the sun
Lunar Eclipse
When the moon passes between Earth and the sun, blocking the sunlight fron reaching the Earth.
Solar Eclipse
The Force that pulls objects on earth together
Gravity
Tide with lest differences between low and high tide
Nap tide
Combined forces that produce a tide with the greatest difference between low and high tide.
Spring Tide
Occurs around September 23 making the beginning of fall in the North Hemisphere.
Autumnal Equinox
When the noon sun is overhead at either 23.5 S or 23.5 N

*Both June and December
Solstice
Imaginary line that passes through Earth's center and the North and South poles
Axis
Measurement of distance from the equator expressed in degrees North and South
Longitude
Movement of one object around another.
Revolution
Umbra
Darkest part of a moon's shadow.
Vernal Equinox

(spring equinox)
Occurs around March 21, and marks the beginning of Spring in the Northern Hemisphere.
Eclipse
When an object in space comes between the sun and a third object, and casts a shadow onthat object.
Rotation
Earth's spinning on it's axis
The posistions of the moon, earth, and the sun.
What causes the phases of the moon, eclipse, and tides.
How much of the sunlit side of the moon faces Earth
Phases of the moon you see depend on what.
Eclipse
When the moon's shadow hits Earth of Earth's shadow hits the moon a _____ occurs.
Tides occur why?
Mainly becasue of differences in how much the moon pulls on different parts of Earth.
Why are there seasons?
Because Earth's axis is tilted as it moves around the sun.
What causes day and night?
Earth's Rotation