1. Motions of Earth, Moon, and Sun Topic 3
Remember to wait for the vocabulary word to pop up at the end! Can you guess it before it comes up?
Created by P. Bordas MS, CCC-SLP

2. Models That Help Explain Apparent Celestial Motions

3. Geocentric Model
Assumption that the Earth is stationary and that most celestial objects revolve around it

4. Heliocentric Model
Assumption that the Earth both rotates on an imaginary axis and revolves around the sun in an orbit. The moon revolves around the Earth.

5. Actual Earth Motions

6. Axis
The imaginary line through the planet from the North Pole to the South Pole

7. Foucault Pendulum
When allowed to swing freely, its path will appear to change in a predictable way. This is evidence of Earth’s rotation because the pendulum – due to inertia – would continue to swing in the original path if the Earth did not rotate

8. Coriolis Effect
Tendency of all particles of matter moving at Earth’s surface to be deflected, or curve away, from a straight-line path

9. Constellation
A group of stars that form a pattern and are used to help people locate celestial objects

10. Earth and Moon Motions and Time

11. Time based on the rotation of Earth as reflected in motions of the sun
Local Time
Time based on the rotation of Earth as reflected in motions of the sun

12. Time Zones
15-degree-wide longitudinal bands which maintain the same time, created to standardize time for regions

13. Actual Motions of Earth’s Moon

14. Tides
The gravitation between the Earth, the moon, and the sun results in a cyclic rise and fall of ocean waters on Earth

15. Eclipse
When a celestial object partly or completely comes into shadow of another celestial object