Presentation on theme: "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."— Presentation transcript:
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
What do you notice about this picture? Sometimes you can see part of the moon that is having nighttime.
Sunlight going from sun to moon to earth. Sunlight going from sun to earth to moon and then back to earth. This is called “earthshine.” The earth is acting like a mirror and reflecting some of our sunlight onto the dark part of the moon!
Phases of the moon are caused by the angle between the earth, moon, and sun.
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!
Two kinds: Lunar eclipses Solar eclipses Video clip on eclipses
Time lapse photography of a lunar 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.
Types of Solar Eclipses 1.Total Solar Eclipses occur when the umbra of the Moon's shadow touches a region on the surface of the Earth. 2.Partial Solar Eclipses occur when the penumbra of the Moon's shadow passes over a region on the Earth's surface.
This is a review of tides since we studied them already!
Video clip on tides Watch the change in water level in the Bay of Fundy in Canada. This happens two times a day because there are two high tides and two low tides each day.
Notice that every six hours there is a high or low tide. If high tide occurs today at 6:00 am in Savannah, GA, what time will be low tide? When will the next high tide occur?
Because the sun also affects the tides, there are times with the sun and move work against each other and times when their forces are added together. Video clip on sun and tides