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  1. Notes Eclipses

  2. 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

  3. 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

  4. 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

  5. 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

  6. Other Notes, cont…

  7. 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

  8. When can we see a solar eclipse? You are here! Next total solar eclipse that can be seen from North America = August 21st, 2017

  9. Closest Viewing of the Total Eclipse = St. Louis at noon

  10. 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

  11. When can we see a solar eclipse? You are here! Next partial solar eclipse that can be seen from North America = June 1, 2011

  12. When can we see a solar eclipse? You are here! Next annular solar eclipse that can be seen from North America = May 20th, 2012

  13. 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

  14. 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

  15. Why is the moon red during a total lunar eclipse?

  16. When can we see a lunar eclipse? Next total lunar eclipse seen from North America =February 21, 2008