Tides and Eclipses

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Tides and Eclipses
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Tides

• The tides are the rising and falling of the ocean
  surface as a result of the gravitational pull of
  the moon and the Sun on the earth.
• The Moon plays a bigger role than the Sun because
  it is closer.

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Effect of the Moon on the Tides
Water bulges on opposite side from the moon also
High Tide in this location
Water gets pulled towards the moon High Tide in
this location.
Low tide here, and on opposite side on the earth
that you cant see.
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Role of the Sun

• The sun also has a gravitational pull on the
  earth.
• When the sun is lined up with the moon and the
  earth, it helps the moon pull on the earth, and
  the tides become more extreme.
• When the sun is not lined up with the moon and
  the earth, it partially cancels out the pull of
  the moon, and the tides are less extreme.

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Spring Tides

• Sun, earth and moon are lined up.
• Higher high tide, Lower low tide.

Regular Tide Level
Tide Level during Spring Tides
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Neap Tides

• High tide is lower than normal, and low tide is
  higher than normal. There is less difference
  between the level of the tides.

Regular High tide level
High Tide level during neap tides
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Occurrence of Neap and Spring Tides

• Spring tides occur when sun, moon and earth are
  lined up Full Moon and New Moon.

Neap Tides occur when the sun and moon pull in
opposite directions First Quarter and Last
Quarter.
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Eclipses

• There are two types of eclipses
• Solar Eclipse- When the moon lines up exactly in
  between the sun and the earth. It blocks out the
  sun so we cant see it.
• Lunar Eclipse- When the earth lines up exactly in
  between the moon and the sun, and prevents
  sunlight from reaching the moon. Or, another way
  to say it is the moon moves into the shadow of
  the earth.

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Solar Eclipse

• Occurs when the moon is a New Moon and lined up
  perfectly with the sun and earth.

Places on earth in the Penumbra will see a
Partial Solar Eclipse
Places on earth in the Umbra see a Total Solar
Eclipse
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Solar Eclipse
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Lunar Eclipse

• Occurs when the moon is a Full Moon and the
  earth, moon and sun are exactly lined up.

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Lunar Eclipse