phases and eclipses
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The terminator is the moving boundary between day and night. Notice that it moves right to left.
The moon does not make its own light. We see it because it reflects light from the sun.
Daytime on the moon
Night on the moon
Terminator
Phases of the moon are caused by the angle between the earth, moon, and sun.
Lunar Phase animation
Another animation
Video clip on phases
Notice that the terminator is moving right to left.
Waxing means getting bigger every night.
Waning means getting smaller every night.
Crescent means less than half the surface of the moon facing you is lit by the sun.
Gibbous means more than half of the surface of the moon facing you is lit by the sun.
Review this diagram and name the phases on the following slides!
Waning crescent
Waxing gibbous
Waxing crescent
Last quarter
Waning crescent
Waning gibbous
First quarter
Two kinds:
Lunar eclipsesSolar eclipses Video clip on
eclipses
Eclipse animation
Time lapse photography of a lunar eclipse
Animation of solar eclipse
Diamond ring effect just before or after a total solar eclipse.
This animation shows the relative sizes of the partial and total eclipse areas. The small, black dot is the umbra. You can see why not many people ever see a total eclipse.
This is a space shuttle photograph of an area of the Earth having a total solar eclipse.
Link to NASA eclipse pageBe sure to scroll down for a list of upcoming eclipses.