Tides & Eclipses Astronomy Page 12 ©Mark Place,

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Presentation transcript:

Tides & Eclipses Astronomy Page 12 ©Mark Place, 2009-20010 www.LearnEarthScience.com

Tides

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.

What causes tides?

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

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.

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)

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

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

1st & 3rd Quarters Neap?

New or Full Moon Spring?

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

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

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

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

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.

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.

Solar Eclipses through 2020

Lunar Eclipse 2010

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.