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Joke of the day
Q: How do you know when the Moon is going broke?
A: When it’s down to its last quarter!
Q: How do you know when the Moon is going broke?
A: When it’s down to its last quarter!
Agenda
Catalyst Go over homework Review of Moon Phases Lesson on Eclipses Exit Ticket
Objective for the day
By the end of the day… SWBAT define and describe the
reasons for a solar and lunar eclipse.
SWBAT distinguish between a
total and partial lunar eclipse and a total and partial solar eclipse.
By the end of the day… SWBAT define and describe the
reasons for a solar and lunar eclipse.
SWBAT distinguish between a
total and partial lunar eclipse and a total and partial solar eclipse.
Eclipses in history and myth
Have been recorded in Chinese and Egyptian history over 4,000 years ago.
In ancient China, the solar and lunar eclipses were regarded as heavenly signs that foretell the future of the Emperor.
Over four millenniums ago, two Chinese astrologers were murdered as they failed to predict a solar eclipse.
Have been recorded in Chinese and Egyptian history over 4,000 years ago.
In ancient China, the solar and lunar eclipses were regarded as heavenly signs that foretell the future of the Emperor.
Over four millenniums ago, two Chinese astrologers were murdered as they failed to predict a solar eclipse.
Chinese Myth
The ancient Chinese believed that solar eclipses occur when a legendary celestial dragon devours the Sun. Also believed that this dragon
attacks the Moon during lunar eclipses.
It was a tradition to bang drums and pots and make loud noises during eclipses to frighten that dragon away. They thought without the sun, there would be no life.
The ancient Chinese believed that solar eclipses occur when a legendary celestial dragon devours the Sun. Also believed that this dragon
attacks the Moon during lunar eclipses.
It was a tradition to bang drums and pots and make loud noises during eclipses to frighten that dragon away. They thought without the sun, there would be no life. Extra credit
opportunity!
What is an eclipse?
An eclipse occurs when the sun, Earth, and Moon line up perfectly.
Key Point #1: The revolution of the Moon causes eclipses.
They occur when Earth or the moon temporarily blocks the sunlight from reaching the other.
Eclipses happen every year.
An eclipse occurs when the sun, Earth, and Moon line up perfectly.
Key Point #1: The revolution of the Moon causes eclipses.
They occur when Earth or the moon temporarily blocks the sunlight from reaching the other.
Eclipses happen every year.
Lunar Eclipse
Key Point #2: A lunar eclipse occurs when the Earth is between the Sun and the moon. The Earth’s shadow falls on the moon.
Key Point #2: A lunar eclipse occurs when the Earth is between the Sun and the moon. The Earth’s shadow falls on the moon.
The Earth has a shadow from the Sun, just like anything on Earth casts a shadow when sunlight shines on it.
Umbra vs. Penumbra
Umbra: the darkest part of the Earth’s or moon’s shadow.
Penumbra: the larger part of Earth’s or the moon’s shadow.
Umbra: the darkest part of the Earth’s or moon’s shadow.
Penumbra: the larger part of Earth’s or the moon’s shadow.
Total vs. Partial Lunar Eclipse
Total Lunar Eclipse: When the moon is totally in the Earth’s umbra.
Partial Lunar Eclipse: When the moon is only partially in the Earth’s umbra and partially in the penumbra.
Total Lunar Eclipse: When the moon is totally in the Earth’s umbra.
Partial Lunar Eclipse: When the moon is only partially in the Earth’s umbra and partially in the penumbra.
Why does the moon appear red?
While the Moon remains completely within Earth’s umbral shadow, indirect sunlight still manages to reach and illuminate it. However, this sunlight must first pass deep through Earth’s atmosphere, which filters out most the blue colored light.
The remaining light is a deep red or orange in color and is much dimmer than pure white sunlight. Earth’s atmosphere also bends or refracts some of this light so that a small fraction of it can reach and illuminate the Moon.
While the Moon remains completely within Earth’s umbral shadow, indirect sunlight still manages to reach and illuminate it. However, this sunlight must first pass deep through Earth’s atmosphere, which filters out most the blue colored light.
The remaining light is a deep red or orange in color and is much dimmer than pure white sunlight. Earth’s atmosphere also bends or refracts some of this light so that a small fraction of it can reach and illuminate the Moon.
Star Advertiser
“A total lunar eclipse will take place early on Dec. 10. As seen from the islands, the moon will be in total eclipse for about 45 minutes, 4:10 to 4:55 am.
The partial phase of the lunar eclipse will begin at about 2:45 a.m., as the moon starts to enter the deep inner shadow (umbra) of Earth. By 4:10 a.m., the eclipse will be total.”
Solar Eclipses
Key Point #3: A solar eclipse occurs when the Moon moves directly between the Sun and Earth and casts its shadow over part of Earth.
Key Point #3: A solar eclipse occurs when the Moon moves directly between the Sun and Earth and casts its shadow over part of Earth.
Total vs. Partial Solar Eclipse
Depends on where on the Earth someone sees the solar eclipse.
Total Solar Eclipse: A solar eclipse as seen from someone in the Moon’s umbra. The Sun is completely blocked by the moon.
Partial Solar Eclipse: A solar eclipse as seen from someone only in the Moon’s penumbra. Part of the sun is visible from Earth.
Depends on where on the Earth someone sees the solar eclipse.
Total Solar Eclipse: A solar eclipse as seen from someone in the Moon’s umbra. The Sun is completely blocked by the moon.
Partial Solar Eclipse: A solar eclipse as seen from someone only in the Moon’s penumbra. Part of the sun is visible from Earth.
Total Solar Eclipse
Partial Solar Eclipse
Solar Eclipses: A coincidence? Some say we are “lucky” to be able to see solar
eclipses. The distance from the Sun to the Earth is about 400
times the distance from the Earth to the moon. The moon is about 400 times smaller than the
Earth. This means that during a solar eclipse, the moon
and sun appear to be the same size! If the distance of mass of the moon were any larger
or smaller, solar eclipses would not look so perfect.
Some say we are “lucky” to be able to see solar eclipses.
The distance from the Sun to the Earth is about 400 times the distance from the Earth to the moon.
The moon is about 400 times smaller than the Earth.
This means that during a solar eclipse, the moon and sun appear to be the same size!
If the distance of mass of the moon were any larger or smaller, solar eclipses would not look so perfect.
When does a lunar eclipse occur? Think-Pair-Share: We discussed moon
phases last class period. During which moon phase would a lunar
eclipse occur? Why doesn’t an eclipse occur every time
we have this moon phase?
When does a lunar eclipse occur?
Key Point #4: A lunar eclipse can only occur during a full moon.
Key Point #4: A lunar eclipse can only occur during a full moon.
When does a solar eclipse occur? Think-Pair-Share: We discussed moon
phases last class period. During which moon phase would a solar
eclipse occur?
When does a solar eclipse occur?
Key Point #5: A solar eclipse can only occur during a new moon.
Key Point #5: A solar eclipse can only occur during a new moon.
F L N SULL
UNAR
EW
OLAR
Exit Ticket
1) Draw a simple picture that shows the orientation of the Sun, Earth, and Moon during a total lunar eclipse.
2) What is the difference between a total solar eclipse and a partial solar eclipse?
![WE ARE GOING TO THE MOON. [e ɪ ] [e] [a ɪ ] [z] [m]](https://img.pdfslide.net/doc/110x75/56649e905503460f94b952b1/we-are-going-to-the-moon-e-e-a-z-m.jpg)
