Books by Philip S. Harrington

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Astronomy For All Ages

The Deep Sky: An Introduction


The Space Shuttle

Star Ware, 4th edition

Star Watch

Touring the Universe Through Binoculars

Touring the Universe Through Binoculars Atlas


Star Watch

Chapter 6.  

Spring Sky Windows


Topics covered Chapter notes Recommended reading

Topics covered

  • Over 50 springtime deep-sky objects are described and plotted on instructive "Sky Windows" that making finding each easy.
  • Click on the thumbnail at right to see a full size sample of one of the chapter's "Sky Windows."

6-3.jpg (192612 bytes)


Chapter 6 notes

  • Page 133.  The parenthetical sentence "(Remember, exit pupil is calculated by dividing the magnification by the telescope's focal ratio, or f/ number)" should read " dividing the focal length of the eyepiece by the telescope's focal ratio."  You can also calculate the exit pupil by dividing the telescope's aperture (best converted to millimeters first) by magnification.


Recommended reading


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