7th Grade Unit 7: Relationships between Earth and Moon Lesson 2: Motion of the Earth and Moon

1. 7th Grade Unit 7: Relationships between Earth and Moon Lesson 2: Motion of the Earth and Moon Vocabulary of Instruction:

2. Terminator • The line between the day side and the night side of a planetary body in astronomy.

3. Eclipse • A chance alignment between the Sun and two other celestial objects within the solar system in which one body blocks the light of the Sun from the otherand casts a shadow on that object.

4. Penumbra • The shadow cast, in an eclipse, where the light is partly cut off by the intervening body. It is the largest part of the shadow.

5. Umbra • Area of the shadow of an eclipse, dark center of a sunspot. The darkest part of a moon’s shadow. This photo is centered on Earth's umbral shadow.

6. Waxing • Part of the moon that is getting bigger and is becoming illuminated by the sun.

7. Waning • Diminishing the size of the moon or slowly getting smaller.

8. Gibbous • Swelling by a regular curve or surface; the moon is gibbous between the half-moon and the full moon.

9. Crescent • Phase of the moon when it is shaped as a C or as an inverted C, new moon, moon in its last quarter.

10. Lunar Limb • The edge of the visible surfaceof the Moon as viewed from Earth.

11. The different shapesof the moon as seen from Earth. There are 8 phases of the moon as described in the next two slides… Phase

12. 8 Phases of the Moon

13. 8 Phases of the Moon

14. Occurs at a full moon when the Earth isdirectly aligned between the Moon and the Sun, blocking the sunlightfrom reaching the Moon. Lunar Eclipse

16. When then moon is directly aligned between the Earth and theSun, blocking the sunlight from reaching the Earth. Solar Eclipse