Seasons and eclipses

Science 7 - 4th Quarter

1. S easons and eclipses archie a. duran

2. Motion/Movements of Heavenly B odies Rotation - spinning on an axis. Revolution - movement around a star or other bodies.

3. Seasons in the Philippines Wet Dry

4. Why are there seasons? Why do seasons change?

5. Factors affecting seasons… tilt of the Earth r evolution of the Earth around the sun direct rays of the sun length of daytime

6. Tilt of the Earth the Earth is tilted at 23.5˚ the tilt of the Earth makes one hemisphere more directed toward the sun

7. Revolution of the Earth around the Sun contributes to uneven exposure of the Earth’s surface to solar energy

8. Revolution of the Earth around the Sun the hemisphere tilted toward the sun will absorb more solar energy and thus experience warmer season.

9. Revolution of the Earth around the Sun the hemisphere tilted away from the sun will experience colder seasons.

10. Direct Rays of the Sun areas of the earth that are exposed to direct rays absorb more solar energy

11. Length of Daytime longer daytime exposes the surface of the earth longer and thus absorbs greater solar energy

12. Length of Daytime shorter daytime lessens the time in which the surface of the earth is exposed to solar energy and thus makes the season colder.

13. Relationship between the length of daytime and season???

14. Motion of the Moon

15. Phases of the Moon New Moon Waxing Crescent 1 st Quarter Moon (Half moon) Waxing Gibbous Full Moon Waning Gibbous Last Quarter Moon (Half moon ) Waning Crescent

16. Shadows and Eclipses Why do shadows form? Why do eclipses occur? Is there relationship between shadows and eclipses? Explain.

17. How do Eclipses Happen?

18. No Eclipse...

19. Eclipses happen when the Sun, Earth, and Moon are... PERFECTLY ALIGNED.

20. Solar Eclipse occurs when the Moon comes directly between the Sun and Earth.

21. Lunar Eclipse occurs when the Earth comes directly between the Sun and Moon.

22. Umbra and Penumbra Umbra - darker part of a shadow Penumbra - lighter part of a shadow

23. Total vs Partial Total Eclipse happens within the umbra total solar eclipse total lunar eclipse

24. Partial Eclipse happens within the penumbra partial solar eclipse partial lunar eclipse Total vs Partial