[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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