Notes

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Notes

• Eclipses

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Eclipse
Solar

• a. Umbra
• -dark, central region of the moons shadow
• -you can see a total eclipse
• b. Penumbra-
• -fainter, outer region of the moons shadow
• -you can see a partial eclipse

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Other Notes

• Can happen b/c the Moon is 400x smaller than the
  Sun, but it is also about 400X closer to Earth
• Can only happen when the moon is in New Moon
  position

• You can see the corona of the sun during a total
  eclipse

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Other Notes, cont

• Only lasts a few minutes (totality)
• Happens 2-3 times per year

http//highered.mcgraw-hill.com/sites/0072482621/s
tudent_view0/animations.html -Chapter 9,
Eclipses animation
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Why dont eclipses happen every month?

• The moons orbit around the Earth is tilted at 5
  degrees compared to the Earths orbit around the
  sun.
• Therefore, the moon, Sun and Earth are not
  perfectly lined up every new or full moon to
  create an eclipse.

http//observe.phy.sfasu.edu/courses/ast105/lectur
es105/chapter02/moon_orbit_tilt_vs_ecliptic.htm
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Other Notes, cont
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http//www.astro.ubc.ca/scharein/a310/SolSysEx/ec
lipse/Eclipse.html
http//www.fourmilab.ch/earthview/pacalc.html
Apogee-The point when the moon is at its farthest
from Earth each month Perigee-The point when the
moon is at its closest to the Earth each month
252,700 miles
221,500 miles
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When can we see a solar eclipse?
You are here!

• Next total solar eclipse that can be seen from
  North America
• August 21st, 2017

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• Closest Viewing of the Total Eclipse
• St. Louis at noon

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When can we see a solar eclipse?

• Next total solar eclipse that can be seen near
  Chicago
• September 14th, 2099

http//eclipse.astronomie.info/sofi/activemaps.htm
l
http//sunearth.gsfc.nasa.gov/eclipse/SEplot/SEplo
t2051/SE2099Sep14T.GIF
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When can we see a solar eclipse?
You are here!

• Next partial solar eclipse that can be seen from
  North America
• June 1, 2011

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When can we see a solar eclipse?
You are here!

• Next annular solar eclipse that can be seen from
  North America
• May 20th, 2012

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Eclipse
Lunar

• a. Umbra
• -total lunar eclipse occurs when the moon is in
  this darker, central region of the Earths shadow
• b. Penumbra-
• -partial lunar eclipse occurs when the moon is
  in this fainter outer region of the Earths shadow

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Other Notes

• Can only happen when the moon is in full moon
  position
• Can last for several hours
• Happen slightly more often than solar eclipses
  (3-4 times per year)
• The moon never fully disappears, but instead
  turns red in color

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Why is the moon red during a total lunar eclipse?
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When can we see a lunar eclipse?

• Next total lunar eclipse seen from North America
  February 21, 2008

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