1. During which lunar phase may the moon be “in between” the Earth and sun?
NEW MOON

2. Which looks like it lasts longer?
Lunar eclipse (moon disappears) is possible at
FULL PHASE
Which looks like it lasts longer?
Solar eclipse (sun disappears) is possible at
NEW PHASE

3. Which phase?

5. Why is there not an eclipse every month?
Because the moon-Earth-Sun system is not really lined up.
Why is there not an eclipse every month?

6. The diagram below shows the Moon orbiting Earth as viewed from space above the North Pole. The Moon is shown at eight different positions in its orbit.
At which two positions of the Moon is an eclipse of the Sun or Moon possible?
(1) 1 and 5 (3) 3 and 7
(2) 2 and 6 (4) 4 and 8

7. The moon is the main cause of daily tidal cycles on Earth.

9. !

10. The moon pulls ocean water into a bulge
The moon pulls ocean water into a bulge. We rotate through the tidal bulge

11. High to low tide about every 6 hours!
The moon pulls ocean water into a bulge. We rotate through the tidal bulge at about 15o/hr. X X X X X
High to low tide about every 6 hours!

12. How long from High to High tide? High to low tide about every 6 hours!
The moon pulls ocean water into a bulge. We rotate through the tidal bulge at about 15o/hr. X X X
How long from High to High tide?
High to low tide about every 6 hours!
About 12 hours.

13. A graph of tidal sea-level changes at a coastal city is shown below.
The number of hours from one high tide to the next high tide is approximately
(1) 4 h (2) 8 h (3) 12 h (4) 24 h

14. …not exactly every 6 hours…

15. The moon has a greater effect on tides than the sun because it’s closer.

16. NEAP tides they pull opposite ways making smaller tides.
SPRING tides they pull together making larger tides.

18. 6/09
Which lunar phases will cause the lowest tides of the month on Earth (Neap Tides)?
C & G (The quarters)