1. Lunar Eclipse

2. Lunar Eclipses Earth casts a shadow into space
Earth’s shadow can block out the moon!
ONLY during FULL phase because the moon, earth and sun are aligned!
Happens only once in a while

3. Lunar Eclipses Earth’s shadow is called the UMBRA
When the umbra is cast on the moon, the moon is blocked
Happens ONLY during full phase because Earth is perfectly lined up between sun and moon.

5. Solar Eclipses

6. Solar Eclipses The moon casts a shadow in space
The moon’s shadow can fall on Earth and block out the sun
Happens onlyin new phase because M is perfectly aligned between S and E

9. Solar Eclipses

10. Total Solar Eclipses only last about 7 minutes in a very narrow range across Earth

11. Tides High Tide is when ocean level is high
High tide happens twice each day
Low Tide is when ocean level is low
Low tide happens twice each day

12. Tidal Range Difference in height between high and low tide
High tide happens 2 times a day
Low tide happens 2 times a day

13. Daily Cycle of Tides Tides are cyclic
Tides are caused by the gravitational pull of the moon on the Earth
As Earth rotates, the moon’s gravity makes the ocean level rise and fall about every 6 hours

14. HIGH TIDES
High Tide
High Tide
Moon’s Gravitational attraction pulls the Earth toward the moon
Moon’s Gravitational attraction pulls the water toward the moon

15. Low Tides happen where the moon’s gravity has no effect!
Tidal Bulge Animation

16. TIDES The GREATEST HIGH tides happen during the full and new moons!!
These are called SPRING TIDES
SPRING tides are HIGHEST HIGH TIDES
The SUN and the MOON act together
Pull the WATER and the EARTH even MORE

17. TIDES The LOWEST HIGH tides happen during quarter moons
The SUN and the MOON act against each other
These are called NEAP TIDES
NEAP tides are LOWEST HIGH TIDES

24. What we observe from earth

26. How much of the moon we see depends on where the moon is in its orbit:
Appearance:

27. Appearance:

28. Appearance:

30. Solar Eclipses Occur when moon’s orbit intersects ecliptic during the new moon phase

32. Moon motion like all celestial bodies except planets which sometime appear to undergo Retrograde Motion

33. Retrograde Motion