1. Tides & Eclipses Astronomy Page 12 ©Mark Place, 2009-20010

2. Tides

5. Tides are the rise and fall of ocean water that occurs every 12
Tides are the rise and fall of ocean water that occurs every 12.5 hours.
Tides occur 2 times a day.

6. What causes
tides?

7. Tides are caused by the
gravitational pull
of the moon & sun

8. Spring Tide Spring tides occur during a NEW and FULL moon.
The sun Earth and moon are in a Straight line.
This tide is the strongest tide.

9. Neap Tide Neap tides occur during 1st and 3rd quarter moons.
The line between Earth and the sun make a Ninety degree angle.(right angle)

11. which types of tides have a larger range?
Based on the diagram,
which types of tides have a larger range?
SPRING TIDES

12. During which phases of the moon
do neap and spring
tides occur?

13. 1st & 3rd Quarters
Neap?

14. New or Full Moon
Spring?

15. How many tides a day?
2 high tides
2 low tides

16. Why are there not exactly
12 hours between tides?
because the moon
revolves around
the Earth while the
Earth rotates

18. solar and lunar eclipses?
What’s the
difference between
solar and lunar eclipses?
Solar
Lunar
Earth goes
into moon’s
shadow
moon goes
into Earth’s
shadow

19. Eclipses
When an object in space comes between the sun and another object it creates an eclipse.

20. Solar Eclipse
Solar eclipse occurs at a New moon phase when the moon is between the sun and the Earth
It occurs because the moon passes directly between the Earth and sun, blocking the light from the sun.

21. Lunar Eclipse
Lunar eclipse occurs during the Full moon phase. Earth blocks the light to the moon.
It occurs because the Earth is directly between the sun and moon blocking the sunlight to the moon.

22. Solar Eclipses through 2020

24. Lunar Eclipse 2010

25. solar and lunar eclipses
Why don’t we have
solar and lunar eclipses
every month?
The moon’s orbit is
tilted 5° from the
Earth’s orbit.