[AZ-Observing] Re: The Real Blue Moon
- From: "Dan Heim" <dan@xxxxxxxxxxxxx>
- To: <az-observing@xxxxxxxxxxxxx>
- Date: Thu, 31 May 2007 11:30:13 -0700
Jeff,
Interesting, but I don't buy their explanation for a truly blue-colored
Moon. If one micron water droplets scatter red & green, they should also
scatter blue and violet (which have shorter wavelengths). At least that's
my understanding of scattering. Only when the wavelengths exceed the
scattering body's dimensions do you get diffraction of waves around the
body. Unless I'm missing some other optical effect here?
I read somewhere once that truly blue Moons can be caused by fine smoke
particles which can act like a filter for blue light, but now that I think
about it, that explanation suffers from the same problem.
Dan Heim
President
Desert Foothills Astronomy Club
http://www.dfacaz.org
----- Original Message -----
From: "Jeff Hopkins" <phxjeff@xxxxxxxxxxx>
To: <az-observing@xxxxxxxxxxxxx>
Sent: Thursday, May 31, 2007 11:03 AM
Subject: [AZ-Observing] The Real Blue Moon
> See
>
> http://science.nasa.gov/headlines/y2007/30may_bluemoon.htm
>
> Jeff
> --
> Jeff Hopkins
> HPO SOFT
> Counting Photons
> http://www.hposoft.com/Astro/astro.html
> Hopkins Phoenix Observatory
> 7812 West Clayton Drive
> Phoenix, Arizona 85033-2439 U.S.A.
> (623)849-5889
> (623) 247-1190 (Fax)
> www.hposoft.com
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