Student Exploration: 3D Eclipse Test Essay

948 Words Apr 3rd, 2014 4 Pages
Name: ______________________________________ Date: ________________________

Student Exploration: 3D Eclipse

Vocabulary: eclipse, lunar eclipse, path of totality, penumbra, solar eclipse, umbra

Prior Knowledge Questions (Do these BEFORE using the Gizmo.)

1. Have you ever seen an eclipse? If so, describe what you well vary.

2. About how often do you think eclipses happen? Well vary.

Gizmo Warm-up
If you see a two-dimensional image of the Earth, Moon, and Sun, you might predict that an eclipse occurs every time the Moon passes in front of or behind Earth, or about twice a month. However, eclipses occur much more rarely.

The 3D Eclipse Gizmo™ shows two views of the Earth, Moon, and Sun: a top view (above) and
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Activity B:

Lunar eclipse
Get the Gizmo ready:
Click Reset. Under Shadows, select Earth.
Set the Moon distance to 1.00 and the Moon angle to 0.0°.

Introduction: A lunar eclipse occurs when the Moon goes into Earth’s shadow. If the Moon goes into Earth’s penumbra, it is called a penumbral lunar eclipse. If the Moon goes into Earth’s umbra, it is a total lunar eclipse. A partial lunar eclipse occurs when only part of the Moon goes into Earth’s umbra. (Note: Earth’s penumbra is not shown in the Gizmo.)

Question: What controls whether a lunar eclipse will occur?

1. Observe: Click Play, and then click Pause when the Moon is in Earth’s shadow. Select the Moon view. What do you see? ________________________________________________
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2. Observe: Set the speed to a lower setting and click the Back button until just before Earth’s shadow crosses the Moon. Click Play and describe what you see.

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3. Infer: Select the Earth view. Who on Earth would be able to see the lunar eclipse? Explain your

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