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Baily's beads during a total solar eclipse. The irregular landscape of the Moon means that its edge isn't perfectly smooth as it passes in front of the sun. It looks as if there are beads of bright sunlight coming through valleys and between mountains. They're named in honor of British astronomer Francis Baily who wrote an extensive account of them.  ©Mona Evans, “Solar Eclipses” http://www.bellaonline.com/articles/art28395.asp

Baily's beads during a total solar eclipse. The irregular landscape of the Moon means that its edge isn't perfectly smooth as it passes in front of the sun. It looks as if there are beads of bright sunlight coming through valleys and between mountains. They're named in honor of British astronomer Francis Baily who wrote an extensive account of them. ©Mona Evans, “Solar Eclipses” http://www.bellaonline.com/articles/art28395.asp

Diamond ring effect. The Moon's surface isn't smooth and just before totality in an eclipse the last bit of sunlight shines through the lunar valleys. ©Mona Evans, “Solar Eclipses” http://www.bellaonline.com/articles/art28395.asp

Diamond ring effect. The Moon's surface isn't smooth and just before totality in an eclipse the last bit of sunlight shines through the lunar valleys. ©Mona Evans, “Solar Eclipses” http://www.bellaonline.com/articles/art28395.asp

Solar eclipse, Cairns, Australia 2012. The eclipsed Sun reappearing and peeking through the clouds. (Photo: Bob Winter) ©Mona Evans, “Solar Eclipses” http://www.bellaonline.com/articles/art28395.asp

Solar eclipse, Cairns, Australia 2012. The eclipsed Sun reappearing and peeking through the clouds. (Photo: Bob Winter) ©Mona Evans, “Solar Eclipses” http://www.bellaonline.com/articles/art28395.asp

Asellus Australis (gamma Cancri) and total solar eclipse. In the darkness of a total solar eclipse, stars and planets may be seen during the daytime. Here gamma Cancri is some 0,5 degrees to the left (east) of the totally eclipsed Sun.  (Credit: Gote Flodqvist, 1981) Mona Evans, “Solar Eclipses” http://www.bellaonline.com/articles/art28395.asp

Asellus Australis (gamma Cancri) and total solar eclipse. In the darkness of a total solar eclipse, stars and planets may be seen during the daytime. Here gamma Cancri is some 0,5 degrees to the left (east) of the totally eclipsed Sun. (Credit: Gote Flodqvist, 1981) Mona Evans, “Solar Eclipses” http://www.bellaonline.com/articles/art28395.asp

Hybrid solar eclipse 2013-11-03. A montage of images of the total eclipse seen from Gulu, Uganda. (Credit: Balraj Chauhan) Mona Evans, “Solar Eclipses” http://www.bellaonline.com/articles/art28395.asp

Hybrid solar eclipse 2013-11-03. A montage of images of the total eclipse seen from Gulu, Uganda. (Credit: Balraj Chauhan) Mona Evans, “Solar Eclipses” http://www.bellaonline.com/articles/art28395.asp

If you were on the Moon during a total lunar eclipse, you'd see a total solar eclipse. It might look something like this, with the Earth's nightside faintly shining. (Credit: Hana Gartstein) Mona Evans, "Lunar Eclipses" http://www.bellaonline.com/articles/art28454.asp

If you were on the Moon during a total lunar eclipse, you'd see a total solar eclipse. It might look something like this, with the Earth's nightside faintly shining. (Credit: Hana Gartstein) Mona Evans, "Lunar Eclipses" http://www.bellaonline.com/articles/art28454.asp

Solar corona, 2012 eclipse in Australia.  A composite image, "typical of solar maximum, very intricate and chaotic structure", taken by Francisco Diego. ©Mona Evans, “Solar Eclipses” http://www.bellaonline.com/articles/art28395.asp

Solar corona, 2012 eclipse in Australia. A composite image, "typical of solar maximum, very intricate and chaotic structure", taken by Francisco Diego. ©Mona Evans, “Solar Eclipses” http://www.bellaonline.com/articles/art28395.asp

Annular solar Eclipse of 5/20/2012 - Robin Shadows. Photo: David M., Denver, Colo.  This is the best picture I've ever seen of eclipse images filtered through leaves - it will surely make you smile! ©Mona Evans, “Solar Eclipses” http://www.bellaonline.com/articles/art28395.asp

Annular solar Eclipse of 5/20/2012 - Robin Shadows. Photo: David M., Denver, Colo. This is the best picture I've ever seen of eclipse images filtered through leaves - it will surely make you smile! ©Mona Evans, “Solar Eclipses” http://www.bellaonline.com/articles/art28395.asp

Geometry of a solar eclipse. Since the Moon is small compared to Earth its shadow is narrow.  Any place where the darker part of the shadow (the umbra) falls would have a total eclipse, but within the outer part of the shadow (the penumbra) the eclipse is only partial. Mona Evans, "Solar Eclipses" http://www.bellaonline.com/articles/art28395.asp

Geometry of a solar eclipse. Since the Moon is small compared to Earth its shadow is narrow. Any place where the darker part of the shadow (the umbra) falls would have a total eclipse, but within the outer part of the shadow (the penumbra) the eclipse is only partial. Mona Evans, "Solar Eclipses" http://www.bellaonline.com/articles/art28395.asp

ISS transit of the Sun during the March 20. 2015 partial solar eclipse. (Credit and copyright: Thierry Legault) Mona Evans, “Solar Eclipses” http://www.bellaonline.com/articles/art28395.asp

ISS transit of the Sun during the March 20. 2015 partial solar eclipse. (Credit and copyright: Thierry Legault) Mona Evans, “Solar Eclipses” http://www.bellaonline.com/articles/art28395.asp

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