SUNSET: 
Stargazer's Corner: Adventures Under the Night Sky
Simple Formulas for the Telescope Owner
Simple telescope formulas — how to calculate what you need to know about your telescopes, oculars, and binoculars.
Stargazer's Corner: Adventures Under the Night Sky
Simple telescope formulas — how to calculate what you need to know about your telescopes, oculars, and binoculars.
By: Chuck Hawks November 20, 2017
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