What causes the phases of the moon?

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Presentation transcript:

What causes the phases of the moon? Sun Earth Moon

When you observe a crescent moon in the evening, do the tips point left or right? Facing South sun West

Can a full moon rise at midnight? Sun No! New Moon Half Moon Earth Full Moon

Moon phases The lighted side of the Moon faces away from Earth. How the moon appears to Earth dwellers at different positions in its orbit is shown below:

On the scale of the earth as a 10” globe, how far is the moon, sun, etc.? 25 feet Sun: 1.9 miles Pluto: 73 miles Alpha Centauri: 500,000 miles Space Shuttle: 0.25 inch

What causes an eclipse? Sun Solar Eclipse Earth Lunar Eclipse

The lunar cycle An eclipse is when light is obscured by an object. The Sun-facing side of the Moon is lit by sunlight almost all the time.

Solar eclipses A solar eclipse occurs when the Moon’s shadow falls on Earth.

Why do we always see the same face of the moon? Earth Moon

What causes the tides? Sun Moon Earth Moon

Tides The daily cycle of rising and falling ocean levels is called a tide.

Where is the center-of-mass of the earth+moon? R = 0.75R e Earth

Spring tides The gravity from the Sun can work with the Moon to create unusually high and low tides. Unusually high and low tides are called spring tides.

Where is the center-of-mass of the sun+earth? R = 0.0006R s Sun

What does the orbit of the moon around the sun look like?

Neap tides Neap tides occur when there is unusually little difference between high and low tides