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Message from discussion Solar eclipse magnitude
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Greg Neill  
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 More options 13 Feb 2006, 18:54
Newsgroups: sci.astro
From: "Greg Neill" <gneill...@OVE.THIS.netcom.ca>
Date: Mon, 13 Feb 2006 13:54:36 -0500
Local: Mon 13 Feb 2006 18:54
Subject: Re: Solar eclipse magnitude
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"Cristiano" <cristiano...@NSquipo.it> wrote in message news:43ef6400_1@x-privat.org...
> I wrote a program to calculate the parameters of an eclipse.

> For the 2006 Mar 29 solar eclipse I get the magnitude 1.0260, while here:
> http://sunearth.gsfc.nasa.gov/eclipse/OH/image1/SE2006Mar29-Fig2.GIF
> there is 1.0515.

> In that site
> http://sunearth.gsfc.nasa.gov/eclipse/SEcat/SEcatkey.html
> it is said that: "Eclipse magnitude is the fraction of the Sun's diameter
> obscured by the Moon."
> which is clearly wrong because with that definition the maximum magnitude
> would be 1.

> In my program I used the formula:
> G= (Sl + Ss - d) / 2 / Ss
> where Sl and Ss are the Moon and Sun semidiameters and d is the distance
> between the center of the Sun and of the Moon.

> With my prog I get the NASA's magnitude when I do Sl/Ss which is 1,0521.

> Is there any standard definition for the magnitude?

> Thanks
> Cristiano

Try here:

http://www.csiro.au/helix/eclipse/solar/eclipse_area.html


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