[AZ-Observing] Eclipse Magnitude and Obscuration

From: Tom Polakis <tpolakis@xxxxxxx>
To: <az-observing@xxxxxxxxxxxxx>
Date: Thu, 7 Apr 2005 18:59:45 -0400

I just learned that the magnitude of an eclipse represents the fraction of the 
sun's diameter that is covered (4%), whereas the obscuration is the fraction of 
the sun's area that is covered (0.9%).

Using that definition, my 20-inch telescope has an obscuration by the secondary 
mirror of only 3.2%.

Tom

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[AZ-Observing] Eclipse Magnitude and Obscuration

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