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Notes Eclipses Solar Eclipse a. Umbra: -dark, central region of the moon’s shadow -you can see a total eclipse b. Penumbra- -fainter, outer region of the moon’s shadow -you can see a partial eclipse Other Notes:

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notes

Notes

Eclipses

eclipse

Solar

Eclipse

a. Umbra:

-dark, central region of the moon’s shadow

-you can see a total eclipse

b. Penumbra-

-fainter, outer region of the moon’s shadow

-you can see a partial eclipse

other notes
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
other notes cont
Other Notes, cont…
  • Only lasts a few minutes (totality)
  • Happens 2-3 times per year

http://highered.mcgraw-hill.com/sites/0072482621/student_view0/animations.html#

-Chapter 9, Eclipses animation

why don t eclipses happen every month
Why don’t eclipses happen every month?
  • The moon’s orbit around the Earth is tilted at 5 degrees compared to the Earth’s 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/lectures105/chapter02/moon_orbit_tilt_vs_ecliptic.htm

slide11

http://www.astro.ubc.ca/~scharein/a310/SolSysEx/eclipse/Eclipse.htmlhttp://www.astro.ubc.ca/~scharein/a310/SolSysEx/eclipse/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

when can we see a solar eclipse
When can we see a solar eclipse?

You are here!

Next total solar eclipse that can be seen from North America =

August 21st, 2017

when can we see a solar eclipse15
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.html

http://sunearth.gsfc.nasa.gov/eclipse/SEplot/SEplot2051/SE2099Sep14T.GIF

when can we see a solar eclipse16
When can we see a solar eclipse?

You are here!

Next partial solar eclipse that can be seen from North America =

June 1, 2011

when can we see a solar eclipse17
When can we see a solar eclipse?

You are here!

Next annular solar eclipse that can be seen from North America =

May 20th, 2012

eclipse19

Lunar

Eclipse

a. Umbra:

-total lunar eclipse occurs when the moon is in this darker, central region of the Earth’s shadow

b. Penumbra-

-partial lunar eclipse occurs when the moon is in this fainter outer region of the Earth’s shadow

other notes20
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
when can we see a lunar eclipse
When can we see a lunar eclipse?

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