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In addition
The star test often allows you to correct the optical difficulty immediately in the field
and reliable test for optical performance
two fifth-magnitude stars that look alike but are nonetheless very different
By carefully following a method known as star-hopping
Magnificent Aurora Charts In additionBy 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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