Wonders Of The Sky 2009 Sunset Sky

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Wonders Of The Sky 2009 Sunset Sky

  1. 1. Wonders of the Sky
  2. 2. Wonders of the Sunset Sky
  3. 3. Water Reflection
  4. 4. Setting Sun <ul><li>The setting or rising sun can often appear distorted due to effects of earth’s atmosphere </li></ul><ul><li>The setting or rising sun often appears oval-shaped, and its light is reddened </li></ul><ul><li>The sun can also appear “broken” in separate layers, each created by air of different temperatures </li></ul>http://www.isc.tamu.edu/~astro/research/sdsun950423.gif
  5. 5. Oval Setting Sun http://www.astro.uiuc.edu/~kaler/arc/vt1-1b.jpg
  6. 6. Eclipsed Setting Sun, Alaska, March 18, 2007
  7. 7. Green Flashes <ul><li>Sometimes the setting sun will emit a green flash , an intense burst of green light </li></ul><ul><li>The green flash is caused by the atmosphere acting as a prism upon the last bit of setting sun </li></ul><ul><li>The green flash is usually only observed as the sun sets over the ocean </li></ul>http://mintaka.sdsu.edu/GF/papers/JOSA/green.gif
  8. 8. Crepuscular Rays <ul><li>Visible near sunrise or sunset </li></ul><ul><li>Crepuscular rays are a perspective effect, the rays are actually parallel </li></ul><ul><li>Also anti-crepuscular , appear to converge opposite the sun </li></ul>http://www.cimms.ou.edu/~doswell/photopg/crepusc.JPG
  9. 9. Anticrepuscular Rays http://epod.usra.edu/archive/images/0507200013.jpg
  10. 10. Parallel Rays?
  11. 11. Crepuscular Sunset
  12. 12. Volcanic Sunsets <ul><li>Major volcanic eruptions inject tremendous amounts of dust into the atmosphere </li></ul><ul><li>This dust creates dramatically red that last for months </li></ul><ul><li>The sunset depicted in Munch’s “The Scream” was enhanced due to the eruption of Krakatoa in 1883 </li></ul>Red sunset following Mt. Pinatubo eruption, 1992
  13. 13. Sunset Colors Edvard Munch, The Scream , 1893
  14. 14. Volcanic Sunset <ul><li>Mt. Kasatochi, AK eruption, Aug 2008 </li></ul>
  15. 15. Kasatochi Sunset, Kansas
  16. 16. Sunrise & Seasons http://individual. utoronto .ca/ kalendis /seasons. htm
  17. 17. Earth’s Shadow <ul><li>The earth’s shadow is often visible for a few minutes after sunset as a dark blue arc rising along the eastern horizon </li></ul><ul><li>When cast upon the moon, the earth’s shadow causes eclipses </li></ul><ul><li>The upper, pinkish edge of the shadow is termed the Belt of Venus </li></ul>Earth’s shadow at sunset
  18. 18. Earth’s Shadow & Belt of Venus http://www.slublog.com/archives/Belt%20of%20Venus.jpg Belt of Venus The full moon has just risen
  19. 19. Summit Shadows on Mountaintops http://www.mit.edu/people/hilstad/pictures/2002-Aconcagua/Summit_day_shadows_900x600.jpg
  20. 21. Full Moon Rising <ul><li>The full moon can be seen rising in the east as the sun sets in the west, </li></ul><ul><li>Like the low sun, the rising moon often appears oval-shaped, distorted, and reddened </li></ul>http://www.eyeswideweb.com/gallery/albums/Pawps-visits-Kazza/Rocklands_Moon_rise.sized.jpg
  21. 22. Red Moonrise http://amateurastronomy.org/Picts/bobbotts/Moonrise.jpg Notice the oval shape produced by distortion in earth’s atmosphere
  22. 23. Moon from Antarctica
  23. 24. I See a Bad Moon …
  24. 25. Harvest Moon <ul><li>The harvest moon is the full moon closest to the autumn equinox (Sept 21) </li></ul><ul><li>The Harvest Moon rises only 20 minutes or so later each night </li></ul><ul><li>Moonrises are usually much longer apart on successive evenings </li></ul>http://cayankee.blogs.com/photos/uncategorized/harvest_moon.jpg
  25. 26. Moon Illusion <ul><li>The moon and sky objects appear larger when they are close to the horizon </li></ul><ul><li>In photos, there is no change in size </li></ul><ul><li>Large rising or setting moons are illusory </li></ul><ul><li>Probably results from comparison to land features such as trees and buildings </li></ul>
  26. 27. Which moon appears larger?
  27. 29. Rising Moon
  28. 30. Man, Rabbit in the Moon
  29. 31. Moon Ball Player
  30. 32. Blue Moon <ul><li>When a second full moon occurs within the same month, it is termed a blue moon </li></ul><ul><li>This happens every few months </li></ul><ul><li>Other blue moons may have been caused by volcanic dust in the atmosphere </li></ul>http:// www. inconstantmoon .com/ cyc _blue. htm
  31. 33. Rocket Contrail <ul><li>Rocket launches at sunset leave visible contrails still illuminated by sunlight </li></ul><ul><li>Composed of ice crystals </li></ul><ul><li>Rocket contrails become distorted by motion of upper air </li></ul>
  32. 34. Minuteman II Launch, Vista, CA (June ’97)

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