2. Welcome to PPT Astronomy Sun, moon, tides Presented By:- Mr. D. S.Meena TGT (S. St.), Jawahar Navodaya Vidyalaya Multhan, Distt. Dhar M.P., India, 454660 Email: durga_shankar4u@rediffmail.com Mobile: –9009787408 1

3. Astronomy Sun, moon, tides

4. Characteristics of the moon w Spherical; made of rock w Has no atmosphere, no water, and no living things w Drastic temperature changes w Earth’s natural satellite

5. Moon and its effects w One- fourth of the Earth’s diameter w revolves around the earth every 29 1/2 days w the gravity of the moon controls the tides (trans.)

6. Questions w What are three characteristics of the moon?

7. Types of tides (show trans.) w Spring tides- gravity of the sun and moon work together (tide is high) w Neap tides- gravity of the sun and moon PULL against each other (tide is low)

8. Phases of the moon w New moon w Crescent w First quarter w Gibbous w Full moon w Gibbous w Third Quarter w Crescent w New moon

9. Questions w What is the difference between a spring tide and a neap tide?

10. Eclipses (show trans.) w Solar eclipse- sunlight is blocked by the moon w lunar eclipse- Earth is between the sun and moon w moon is visible because of reflected sunlight

11. Questions w Why do we see the moon at certain times of the month? w How are solar eclipses different from lunar eclipses?

12. Characteristics of the sun (show trans.) w Made of plasma (high energy form of matter) w produces energy as a result of nuclear fusion w core temperature (15,000,000 ºC)

13. Sun w 150,000,000 kilometers from Earth w makes up 99% of the mass of the solar system

14. Questions w How does the sun produce energy? w What are three characteristics of the sun?

15. Thanks Presented By:- Mr. D. S.Meena TGT (S. St.), Jawahar Navodaya Vidyalaya Multhan, Distt. Dhar M.P., India, 454660 Email: durga_shankar4u@rediffmail.com Mobile: –9009787408