Aim: How does the moon affect the earth?

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Presentation transcript:

Aim: How does the moon affect the earth? Do Now: Why does the moon look different at different times of the moonth?

Describe what happened in the Simpsons clip. Why did it get dark Describe what happened in the Simpsons clip. Why did it get dark? Why do you have to protect your eyes?

How do we define an eclipse? Eclipse- when the moon, sun, and earth are all aligned in a straight line and blocks the light from reaching the other object or casts a shadow on it. the Moon passes in-between the Earth and Sun or when the Moon passes into Earth’s shadow. Shadows: Umbra – total darkness, inner part of shadow Penumbra – partial darkness (light grey) outer part of shadow Eclipse As the moon revolves around Earth, it usually passes above or below Earth’s shadow. When the moon passes directly through Earth’s shadow, sunlight is blocked from reaching the moon, a lunar eclipse occurs. A lunar eclipse can only occur during a full-Moon phase. A solar eclipse is an eclipse of the sun and this occurs when the Moon passes directly between Earth and the Sun. During a solar eclipse, the Moon casts a shadow on Earth. A solar eclipse can only occur during a new-Moon phase. Solar and Lunar eclipses do not occur at every full-Moon and new-Moon phase because the Moon’s orbit is tilted 5º. Identify two parts of a shadow

How does a solar eclipse occur? Solar eclipse: when the new moon moves right in front of the sun and casts a shadow onto earth Total Solar Eclipse (umbra) New Moon SUN Penumbra Earth Umbra Partial Solar Eclipse (penumbra) Sun's Corona Light surrounding the outside of the moon is called the Corona This light can damage your eyes (U.V light)

How does a lunar eclipse occur? Lunar eclipse: when the full moon moves into Earth’s shadow Partial Lunar Eclipse (penumbra) Umbra Penumbra Full Moon Earth SUN Total Lunar Eclipse (umbra) The Earth casts its shadow on the Moon causing the Moon to look orange or red due to the refraction of light.

Why don’t eclipses occur every month? Eclipses do not happen every month because the moon’s orbit is tilted 5°. Solar Eclipse (new moon) Lunar Eclipse (full moon) At which position would an observer see a solar eclipse and at which position would you see a lunar eclipse?

How are these to pictures different? Why? How many times do tides occur? High Tide Low Tide Tides are cyclic and predictable Occur about every 6 hrs and 12 mins Between two high tides or two low tides is12 hrs & 24 mins tide cycle will take about 24 hrs and 50 mins (50 minute delay) Tides – rise and fall of the ocean water due to the gravitational pull between the moon and sun

How does the moon affect the tides? Spring Tides – highest high tides and lowest low tides. During new and full moon moon, sun, & earth are all aligned in a straight line. Neap Tides – lowest high tides and highest low tides. During first and last quarter moon, sun, & earth are at right angles. Spring Tides New Full LastQtr Neap Tides FirstQtr

At which two positions will the highest high tides and lowest low tides occur? Neap Tide (last quarter) Spring Tide (new Moon) Spring Tide (Full Moon) Neap Tide (first quarter) At which two positions will the highest low tides and lowest high tides occur?

Summary Activity Question Arrange the Moon to show: 1) solar eclipse 2) lunar eclipse 3) spring tides and 4) neap tides Neap tides M E Lunar Eclipse Spring tides Solar Eclipse Spring tides Neap tides

Extra Summary Questions At which two positions of the Moon is an eclipse of the Sun (solar) or Moon (lunar) possible? 1 and 5 (3) 3 and 7 2 and 6 (4) 4 and 8

Extra Questions

High Tide Low Tide Low Tide High Tide Extra Extra Questions Base your answers on the diagram below which shows one position of the Moon in its orbit around the Earth. Letters W, X, Y, and Z are locations on Earth’s Surface. High Tide Low Tide Low Tide High Tide 1. Indicate whether a high ocean tide or a low ocean tide is occurring at locations W, X, Y, Z.

Extra Extra Extra Questions

How do we define an eclipse? Eclipse- when the moon, sun, and earth are all aligned in a straight line and blocks the light from reaching the other object or casts a shadow on it. the Moon passes in-between the Earth and Sun or when the Moon passes into Earth’s shadow. Shadows: Umbra – Penumbra – Identify two parts of a shadow

How does a solar eclipse occur? Solar eclipse: when the new moon moves right in front of the sun and casts a shadow onto earth

How does a lunar eclipse occur? Lunar eclipse: when the full moon moves into Earth’s shadow Umbra Penumbra The Earth casts its shadow on the Moon causing the Moon to look orange or red due to the refraction of light.

How are these to pictures different? Why? How many times do tides occur? High Tide Low Tide Tides are cyclic and predictable Occur about every 6 hrs and 12 mins Between two high tides or two low tides is12 hrs & 24 mins tide cycle will take about 24 hrs and 50 mins (50 minute delay) Tides – rise and fall of the ocean water due to the gravitational pull between the moon and sun

How does the moon affect the tides? Spring Tides – highest high tides and lowest low tides. During new and full moon moon, sun, & earth are all aligned in a straight line. Neap Tides – lowest high tides and highest low tides. During first and last quarter moon, sun, & earth are at right angles.

Extra Summary Questions At which two positions of the Moon is an eclipse of the Sun (solar) or Moon (lunar) possible? 1 and 5 (3) 3 and 7 2 and 6 (4) 4 and 8

Extra Questions