1. CHAPTER 24.4 EARTH- MOON-SUN SYSTEM

2. Learning Targets 1.Describe how Earth’s movement affect seasons and cause day and night 2.Explain solar and lunar eclipses 3.Describe the phases of the Moon and explain why they occur 4.Explain how movements of the Earth and Moon affect Earth’s tides

3. Earth-Moon-Sun System 1.Earth’s Rotation - Spin is counterclockwise when viewed from the North Pole 2.Sun, Moon, stars rise in the East and set in the West

4. Day-Night Cycles 1.Day: time required to rotate once 2.Length determined by whether the North or South is tilted toward the Sun a)Longer days + Direct Sun = Summer b)Shorter days + Indirect Sun = Winter 3.Equator: equal day length all year 4.Poles: six months day, six months night

8. Seasons 1.Length of day changes with seasons 2.Angle of sunlight changes with seasons 3.Sun directly overhead = More direct light 4.More direct light = More heat a)Longer days + Direct Sun = Summer b)Shorter days + Indirect Sun = Winter

10. The path of the sun in the sky

12. Solar Eclipse 1.Moon moves between the Earth and Sun 2.Photosphere is blocked a)Corona becomes visible b)Earth gets dark for a few seconds 3.Aug. 21, 2017

15. Lunar Eclipse 1.Earth between Sun and Moon 2.Moon goes dark because it does not make its own light 3.Sep 28, 2015

17. Lunar Eclipse 1.The umbra is the inner, cone shaped part of the shadow, in which all of the light has been blocked. 2.Penumbra where only part of the light is blocked

19. Phases of the Moon 1.Moon reflects sunlight 2.We only see the part of the Moon that is both facing the Sun and the Earth 3.This means the visible portion of the Moon is constantly changing

21. The phases of the Moon

23. Tides 1.Caused by the Moon’s gravitational pull on the oceans a)Sun also affects the tides 2.Spring tide a)Extreme tides; higher high, lower low 3.Neap tide a)Moderate tides; lower high, higher low