Difference between revisions of "December 23, 2004"
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| − | + | [[File:LPOD-2004-12-23.jpeg|LPOD-2004-12-23.jpeg]] | |
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| − | + | <tr><td><div align="center" class="main_sm"><p>Image Credit: [mailto:digidodi@yahoo.com Dominique Dierick, aka Dodi]</p> | |
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| − | + | <p align="center"><b>Double Rings </b></p> | |
| − | + | <p align="left">When I see a [[January_22,_2004|halo]] around the Moon I feel lucky at witnessing such a magical sight. And I usually explain to someone that its due to sunlight, bounced off the Moon and refracted thru ice crystals in the atmosphere to our eyes. But this wonderful picture is not of a halo, nor even two halos. A halo is a ring 44 degrees wide, but these rings are much smaller - the inner one is 2.5 degrees in diameter, and the outer is 5 degrees. Such small circles are called coronas, and the small size results from the light being diffracted by water droplets or small needles of ice. The color sequence from the inside out is blue, yellow, red. Multiple coronas occur when water drops of different size are present. The next time thin clouds obstruct your view of the lunar surface check to see if there is, no not a silver lining, but diffraction ring or corona. And also pay attention when thin clouds cloak Venus, Jupiter and Sirius, for small and faint coronas have been occasionally seen around them! </p> | |
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| − | <p align="left" | + | <p align="right">— [mailto:tychocrater@yahoo.com Chuck Wood]</p></blockquote> |
| + | <p align="left"><b>Technical Details:</b><br> | ||
Nikon 180mm and Nikon D70</p> | Nikon 180mm and Nikon D70</p> | ||
<p><b>Related Links:</b><br> | <p><b>Related Links:</b><br> | ||
[http://www.astronomie.be/dodi/astro/astmenu.htm Dodi's Twilight Zone of Photography] | [http://www.astronomie.be/dodi/astro/astmenu.htm Dodi's Twilight Zone of Photography] | ||
<br>[http://web.telia.com/~u87720758/corona/corona_inde Corona] | <br>[http://web.telia.com/~u87720758/corona/corona_inde Corona] | ||
| − | <p | + | </p> |
| + | <p><b>Yesterday's LPOD:</b> [[December 22, 2004|Swell Linne]] </p> | ||
| + | <p><b>Tomorrow's LPOD:</b> [[December 24, 2004|Introducing PlanetWarp!]] </p> | ||
<p><hr><center> | <p><hr><center> | ||
<b><FONT COLOR="#FF0000">VOTE FOR YOUR FAVORITE LPODs!</FONT></b><br> | <b><FONT COLOR="#FF0000">VOTE FOR YOUR FAVORITE LPODs!</FONT></b><br> | ||
| − | During Dec 25 thru Dec 31 LPOD will feature LPODs from the past year that visitors like best. Send [mailto: | + | During Dec 25 thru Dec 31 LPOD will feature LPODs from the past year that visitors like best. Send [mailto:tychocrater@yahoo.com me] an email with your favorite seven LPODs - include their titles and the dates they appeared. Thanks! </center> |
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| − | + | <p align="center" class="main_titles"><b>Author & Editor:</b><br> | |
| − | + | [mailto:tychocrater@yahoo.com Charles A. Wood]</p> | |
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Latest revision as of 15:06, 15 March 2015
Double Rings
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Image Credit: Dominique Dierick, aka Dodi |
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Double Rings When I see a halo around the Moon I feel lucky at witnessing such a magical sight. And I usually explain to someone that its due to sunlight, bounced off the Moon and refracted thru ice crystals in the atmosphere to our eyes. But this wonderful picture is not of a halo, nor even two halos. A halo is a ring 44 degrees wide, but these rings are much smaller - the inner one is 2.5 degrees in diameter, and the outer is 5 degrees. Such small circles are called coronas, and the small size results from the light being diffracted by water droplets or small needles of ice. The color sequence from the inside out is blue, yellow, red. Multiple coronas occur when water drops of different size are present. The next time thin clouds obstruct your view of the lunar surface check to see if there is, no not a silver lining, but diffraction ring or corona. And also pay attention when thin clouds cloak Venus, Jupiter and Sirius, for small and faint coronas have been occasionally seen around them! Technical Details: Related Links: Yesterday's LPOD: Swell Linne Tomorrow's LPOD: Introducing PlanetWarp! VOTE FOR YOUR FAVORITE LPODs! |
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Author & Editor: |
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