EclipsesEclipses

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https://www.youtube.com/watch?v=j1nVsCcKHwI

The Next Lunar Eclipse will be September 28th

POM Chart (in your note book)

PHENOMENON:What did you observe?What evidence do you have?

OBJECTS:Define the system.What objects are

interacting?

MOTION:Describe the motion

that in the model that explains your

observations

Model itModel it

• Use the Sun, Earth, Moon model to demonstrate how the moon can “disappear” from view and return to view later.

Lunar EclipseLunar Eclipse• Occurs at Full Moon

• Sun and moon are in OPPOSITE directions from earth

• The moon moves into the earth’s shadow,

blocking the Sun from shining on the

moon and it darkens.

• Visible to all on night side of earth

• Last 2-3 hours

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Lunar eclipseLunar eclipse

• The curved edge of the Earth’s shadow begins to cut across the face of the moon

• Until the entire moon’s face is covered

• The moon takes on a red glow due to refraction (bending) of the sunlight through the earth’s atmosphere.

Model itModel it

Watch the eclipse in Australia

https://www.youtube.com/watch?v=2lHb5ruGUyw

Using the sun, Earth Moon model, show how the Sun can completely disappear from view

* Next Solar eclipse is Aug 21, 2017

https://www.youtube.com/watch?v=MWBmKQRQsks

SolarSolar Eclipse Eclipse• Occurs when sun and moon are in the

same direction from Earth

• Moon passes directly in front of the Sun

• Occurs during the day, with a new moon

• Turns day into night – sunlight is reduced to almost nothing!

• Lasts a few minutes

• Only a small area can see the total eclipse

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• Umbra: – Point of the sun’s shadow– 270 km wide shadow area (162 miles)– Shadow moves across the earth at 1700km/hr– Solar eclipse lasts only 7.5 min.

• Penumbra:– Wider part of the sun’s shadow

– Area of partial eclipse

• Corona: as the moon covers the body

of the sun, the sun’s atmosphere is seen as a glowing

‘crown’

Lunar or Solar eclipse??Lunar or Solar eclipse??

Is the moon causing a shadow or in a shadow?

• The moon orbits the Earth every 28 days

• So is there an eclipse every month?

• Look at some Data on eclipses

• Look at a Model:

http://highered.mheducation.com/olcweb/cgi/pluginpop.cgi?it=swf::800::600::/sites/dl/free/007299181x/78778/Eclipses_Nav.swf::Eclipse%20Interactive