March 17, 2014

• PAP• You will be getting your CBA

back and we will go over it through a group process.

• We will then go over the Sun, Weather and Oceans TEST and go over it through the same process.

• Birthday Moon is due Wednesday!• TEST over Teks 8.7B- predicting sequence of events

in lunar cycle on Thursday!

March 18, 2014

• What do you know about an eclipse?• Have you ever seen one? Solar or lunar?

Writing Assignment

• Put your name at the top of your paper.• In several paragraphs I want you to write

down all you can remember about the rotation and revolution of the Earth around the sun. How long does it take? What does it result in day and night? Seasons? Please address the Earth’s tilt as it moves around the Sun as well.

Give An Idea

• Each person will have a “give an idea” token. • For one minute your group will discuss the question and

everyone will give their opinion of the answer. If answers differ, you need to determine which is correct.

• The noise level will be 1 meter, meaning I should only hear your voice if I am 1 meter away!

• As you speak, you put your token in the center. YOU ARE NOT ALLOWED TO SPEAK AGAIN UNTIL ALL TOKENS ARE IN THE CENTER and everyone takes one again.

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Eclipses

• The Sun and Moon occasionally line up so that we have an eclipse.

– These eclipses happen every year– To see a solar eclipse, you need to

be on a particular part of the Earth

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Solar Eclipses• When the Moon’s shadow covers part of the Earth• Only happens at New Moon• Three types: Annular, Partial, and Total

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Total Solar Eclipse• Observers in the “umbra” shadow see a total eclipse (safe to view the Sun); can see the

corona• Those in “penumbra” see a partial eclipse—not safe to look directly at Sun• Only lasts a few minutes• Path of Totality about 10,000 miles long, only 100 miles wide

Diamond Ring Effect

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Photo of a Total Solar Eclipse

http://sunearthday.nasa.gov/2006/multimedia/gal_008.php

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Annular Solar Eclipse• When the Moon is too far to completely cover the Sun—the umbra doesn’t

reach the Earth• Sun appears as a donut around the Moon

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Photos of an Annular Eclipse

http://sunearthday.nasa.gov/2006/multimedia/gal_010.php; photos taken by Fred Espenak

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Upcoming Solar Eclipses

• Next Total Solar Eclipse in continental USA—August 21, 2017

13When the Earth’s shadow covers the Moon, we have a lunar eclipse

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Three types of Lunar Eclipses• Penumbral lunar eclipse—the Moon only passes

through the penumbra of Earth’s shadow• Partial lunar eclipse—part of the Moon passes

through the umbra of Earth’s shadow• Total lunar eclipse—the entire Moon passes through

the umbra of Earth’s shadow

• Who on Earth will be able to see a lunar eclipse?Anyone who can see the Moon (anyone who is on the nighttime side of the Earth during the eclipse)

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Images from Fred Espenakhttp://www.mreclipse.com/LEphoto/LEgallery1/LEgallery1.html

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Upcoming Lunar Eclipses

• Apr 15, 2014, TOTAL ECLIPSE –visible here