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and reliable test for optical performance
Calibrate your telescope so that you know exactly how much sky you see through your finder and through the eyepiece of your telescope
The other is a list of 24 nearby stars
By carefully following a method known as star-hopping
Magnificent Aurora Charts and reliable test for opticalBy Bob King, Sky & Telescope Contributing Editor Magnificent Aurora: Your complete guide to nature's greatest light show Have you ever wondered what causes the aurora? Or whats behind its ghostly forms, movements and colors? This guide covers the gamut, from myth to our modern understanding of the phenomenon, in a friendly, non technical way accessible to neophytes and science curious readers alike. Its packed with incredible images from some of the
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