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Eclipses

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by

Kristy Woody

on 21 February 2017

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Transcript of Eclipses

Today's Agenda:
Essential Question
: How are the sun, moon, and Earth connected?

Objective
: I can describe how eclipses occur.

Standard
: 0607.6.7: Explain the difference between a solar and lunar eclipse.

Earth-Moon-Sun System
As you have learned, the moon revolves around the Earth, while the Earth revolves around the sun.

Since the Earth and moon are always moving, they can cast shadows on one another.
Eclipses
An eclipse occurs when one object in space casts a shadow on another object in space.

The changing positions of the moon, Earth, and sun when compared to each other cause eclipses.

Eclipses ONLY occur when all three bodies line up in a particular way.
Solar Eclipse
The moon's orbit around the Earth is slightly tilted compared to Earth's orbit around the sun so the two rarely cross paths.

A solar eclipse occurs when the moon passes directly between the Earth and sun, and casts a
shadow
on the
Earth
.

As Earth rotates on its axis, the moon's shadow traces a path across part of the land below.

If you are located on the part of the Earth that is in the moon's shadow, you will see the moon pass in front of the sun and block it out.


Eclipses
Total vs. Partial Eclipses
During a partial eclipse of the sun, the moon blocks only part of the face of the sun.
A total eclipse occurs when the moon blocks the entire face of the sun from viewers on Earth.

The next total eclipse of the sun to be seen from the United States will occur in 2017.
Think Time:
1. A solar eclipse can only take place during what moon phase?
2. Where is the moon positioned during a solar eclipse?
3. What is the difference between a partial and total solar eclipse?
Lunar Eclipse
A
lunar eclipse
occurs when the Earth comes between the sun and the moon, and the Earth casts a
shadow on the moon
.

A lunar eclipse can only occur when the moon, Earth, and sun are lined up in a row, with the Earth in between the moon and the sun.

During a lunar eclipse, Earth blocks the sun's light from reaching the moon.

From Earth, a lunar eclipse looks like all or part of the moon disappears and then appears once again.


Total vs. Partial Lunar Eclipse
During a total lunar eclipse, the entire lit side of the moon can be seen from Earth.

Earth's shadow only covers the moon if the moon is also directly lined up with Earth and the sun.

A total lunar eclipse usually happens in the same part of the world once or twice a year.
During a partial lunar eclipse, the sun, moon, and Earth are not in a completely straight line.

Part of the moon is in the Earth's shadow, and part is out.
Think Time:
What is the only moon phase in which a lunar eclipse can occur?
Quick Check:
Practice:
Objective: I can describe how eclipses occur
.

On your handout, draw and label a diagram of both a lunar and a solar eclipse. In your own words, describe how each one occurs.

Exit Ticket: www.padlet.com/kwoodyscience/exit


A Total Lunar Eclipse is sometimes called Blood Moon because the Moon may have a deep, red glow when it's only illuminated by the light in the Earth's penumbra.
Where is the Earth positioned during a lunar eclipse?
Review:
Introduction:

https://www.brainpop.com/science/space/eclipse/

Super Moon on 9/27/2015
Full transcript