Phases and Ellipses

Phases and Eclipses

Lesson 3 Vocabulary

Phases - One of the shapes of the moon, as seen from Earth.
Eclipses - The blocking of an object in space by another.
Umbra - The darkest part of a shadow.
Penumbra - The part of a shadow partially covered by the Sun.

Lesson 3 Vocabulary, Cont.

Tide - The periodic rise and fall of ocean level water.
Spring Tide - Tides with the greatest difference between high and low tides.
Neap Tide - The tide with the least difference between high and low tides.
Significant - By how much an action affects another action.

What shape is the moon?

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• Each day, we often see half of the moon from Earth.

• The moon has two sides.

• The side facing Earth is the Near Side.

• The side facing away from Earth is the Far Side, or the dark side of the moon.
  

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Phases

​What might be causing these changes?​

Phases, Cont.

• ​Just like Earth, the moon also rotates and revolves.

• The moon rotates and revolves daily.

• Half of the moon is lit by the Sun.

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The Moon's Movement

Describe what is happening during a waning crescent moon.

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There are two types of eclipses: Lunar eclipses and Solar eclipses.

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Eclipses

• Tides are the rise and fall of sea level that occur about every 12.5 hours.

• This includes 6 hours of high tide and 6 hours of low tide.

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Tides

About how many tides, high and low, occur daily?