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Sky Tonight—May 12, How to see the green flash
Posted By Editor On May 11, 2011 @ 8:38 pm In Earth & Sky | Comments Disabled
Courtesy of EarthSky
A Clear Voice for Science
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You can see green flashes with the eye, sometimes, if you are looking toward a very clear horizon. You must be looking just at sunset, at the last moment before the sun disappears below the horizon and you have to be careful not to look too soon. Wait until just the thinnest rim of the sun appears above the horizon. If you look too soon, the light of the sunset will dazzle (or damage) your eyes, and you will miss that day’s green flash.
There are many different types of green flash. Some describe a streak or ray  of the color green … like a green flame shooting up from the sunrise or sunset horizon. The most common green flash, which many people describe, is a flash of the color green seen when the sun is nearly entirely below the horizon.
You need a distant horizon to see any of these phenomena, and you need a distinct edge to the horizon. These green flashes, streaks, and rays are often seen over the ocean – but you can see them over land, too, if your horizon is far enough away. Pollution or haze on the horizon will hide this instantaneous flash of the color green.
Here is another good article about the green flash  by Peter Michaud.
Here is a rather subtle green flash video . I had to watch it several times to convince myself I saw any green.
By Deborah Byrd 
EarthSky: Space 
CHANDRA Photo Album 
Universe Today 
StarDate Online 
Sky and Telescope 
National Geographic 
Space Com 
Simostronomy Blog 
Amazing Space 
Scope City 
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URLs in this post:
 www.EarthSky.org: http://www.EarthSky.org
 Image: http://www.berthoudrecorder.com/wp-content/uploads/2011/04/phases-r-09.jpg
 Image: http://www.berthoudrecorder.com/wp-content/uploads/2011/05/greenflash_parviainen.jpg
 ray: http://mintaka.sdsu.edu/GF/observing/greenray.html
 Andrew Young’s green flash page: http://mintaka.sdsu.edu/GF/index.html
 pictures of green flashes: http://mintaka.sdsu.edu/GF/pictures.html
 green flash: http://www.bishopmuseum.org/planetarium/greenflash.html
 green flash video: http://www.well.com/user/pk/waterfront/photo-of-the-week/GreenFlashVideo.avi
 Deborah Byrd: http://earthsky.org/team/deborahbyrd
 Astronomy Picture of the Day from NASA/JPL: http://antwrp.gsfc.nasa.gov/apod/
 EarthSky: Space: http://earthsky.org/space
 CHANDRA Photo Album: http://chandra.harvard.edu/photo/
 U.S. Naval Observator Astronomical Information cente: http://www.usno.navy.mil/USNO/astronomical-applications/astronomical-information-center/astronomical-information-center
 Universe Today: http://www.universetoday.com/
 StarDate Online: http://stardate.org/
 Sky and Telescope: http://www.skyandtelescope.com/observing/ataglance/
 National Geographic: http://news.nationalgeographic.com/news/
 Space Com: http://www.space.com/nightsky/
 Simostronomy Blog: http://simostronomy.blogspot.com/
 Amazing Space: http://amazing-space.stsci.edu/tonights_sky/
 The York County Astronomical Society: http://www.ycas.org/tonights_sky.htm
 Scope City: http://www.scopecity.net/
 James S McDonnell Planetarium: http://www.slsc.org/WhatToDo/Planetarium/NightSkyUpdate.aspx
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