Skywatching (Nature Company Guides)

Condition Notes: Used – Acceptable: All pages and the cover are intact, but shrink wrap, dust covers, or boxed set case may be missing. Pages may include limited notes and highlighting, but the text cannot be obscured or unreadable.

Skywatching (Nature Company Guides)

Condition Notes: The item shows wear from consistent use, but it remains in good condition and works perfectly. All pages and cover are intact including the dust cover, if applicable. Spine may show signs of wear.

Skywatching (Nature Company Guides)

Condition Notes: Cover may have light wear, pages in very good condition and binding is sturdy; may have other light shelf wear or creases. May have notes or highlighting.

Uranometria 2000.0 Atlas – Deep Sky Field Guide By Cragin/Bonnano

Take galaxies for example. A galaxy might be quite large but you could have difficulty in locating it if its surface brightness is really dim. What is the opacity of that dark nebula?. Serious observers know that the more they know about an object the better their observing experience.