1. Tides / Eclipses / Phases of the Moon

2. Moon Phase Misconceptions
Moon Phases

3. Phases of the Moon The moon moves through space two ways
Rotates on its axis (27.3 Earth days for one rotation)
Revolves around the Earth (27.3 Earth days for one revolution)
A “day” and a “year” are the same length on the moon

4. Lunar Cycle The time between two full moons is called a lunar cycle
A lunar cycle is 29.5 Earth days
In other words there are days between full moons

5. Phases of the Moon
Like the Earth – half of the moon is always in sunlight
The different shapes of the moon we see are called phases
The phase of the moon we see depends on how much of the sunlit side of the moon faces Earth

6. Waxing and Waning
Waxing – when the portion of the moon you can see is growing
Waning – when the portion of the moon you can see is shrinking
Copy trick in notes

7. New Moon
No Moon Visible

8. Crescent
Moon is less than half lit

9. 1st Quarter / 3rd Quarter
Moon is half lit

10. Gibbous
More than half lit but not full

11. Full Moon
Entire moon disk visible

12. Eclipse
Eclipse - The partial or total blocking of one object in space by another
Moon’s shadow will hit the Earth or the Earth’s shadow will hit the moon
Parts of a shadow
Umbra – the darkest part of a shadow
Penumbra – the larger (not as dark) part of a shadow

13. Lunar Eclipse Lunar Eclipse
Earth blocks sunlight from reaching the moon
Earth’s shadow is cast on the moon
Occurs only during a full moon

14. Solar Eclipse Moon passes between the Earth and Sun
Blocks sunlight from hitting Earth – Moon’s shadow hits Earth
Occurs only during a new moon

15. Eclipse Why don’t we have an eclipse every month?
The moon’s orbit around Earth is tilted at 5°
This keeps the moon out of Earth’s shadow most of the time

16. Eclipses
Lunar Eclipse

17. Eclipses
Solar Eclipse

18. Earth’s Tides
Tides
The periodic rise and fall of large bodies of water
Produced by the gravitational forces of the moon (and to a lesser extent the sun)

19. Lunar Tides – How do they work?
Earth and Moon are attracted to each by the force of gravity
The moon pulls on everything on the Earth’s surface
Earth can hold everything in place except water

20. Lunar Tides
The gravitational attraction of the moon causes the oceans to bulge out in the direction of the moon

21. Lunar Tides Another bulge happens on the opposite side of Earth
Why?
Because the Earth is being pulled towards the moon and away from the water on the far side
Each day there are 2 High tides and 2 Low Tides
12.5 hours between two high tides

22. Types of tides Spring tides
They have NOTHING to do with the season spring
Occur when the moon is full or new and in line with the sun
High tides are very high
Low tides are very low

23. Types of Tides Neap tides Occur during a moons quarter phases
Sun and moon are at right angles (90°)
Cause ocean bulges to cancel each other out
Very weak tides

24. Tidal Bore