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extinction coefficients
Calibrate your telescope so that you know exactly how much sky you see through your finder and through the eyepiece of your telescope
or fold it to focus on individual quadrants or two neighboring quadrants
The observing techniques taught in this book are both easy to learn and powerful
ISBN 13: 9781931559294
The Year-Round Messier Marathon CDs & DVDs extinction coefficientsBy Harvard Pennington Product Information: 8. 50" by 11. 00", 194 pages, hardbound. Among the deepest satisfactions of amateur astronomy is knowing your way around the sky. From the familiar guideposts of the brightest stars, you confidently point your binoculars or telescope toward the Andromeda galaxy, the Hercules cluster, or the Lagoon nebula. This book was written for the person who wants to become deeply familiar with the most famous list of 110
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