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EclipsesEclipses
Page 564Page 564
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
Pg. 564Pg. 564
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
Page 565Page 565
• 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