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Science Forum Index » Astronomy Forum » Solar eclipse magnitude
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| Cristiano |
 Posted: Sun Feb 12, 2006 7:42 am |
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Guest
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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 |
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