A printing error affected two charts in Sky & Telescope's Pocket Sky Atlas by Roger W. Sinnott (Sky Publishing, 2006). On Chart 55, parts of Corona Borealis and Bootes are missing. On Chart C, part of the Virgo Galaxy Cluster is missing.

Here's where the problems are:

• Chart 55: near R.A. 15^h 45^m, Dec. +30° & R.A. 14^h 45^m, Dec. +27°
  
• Chart C: near R.A. 12^h 40^m, Dec. +10°

  Corrected copies of these charts are available as 120-kilobyte Adobe Acrobat (PDF) files, which may be downloaded for free by clicking the following links:

• Chart 55 — Corona Borealis, Serpens Caput, part of Boötes
  
• Chart C — close-up of the Virgo Galaxy Cluster

  To read or print the files, you'll need Adobe Reader software, which is available for free for computers running Windows, Mac OS, or Unix. If you don't already have a copy, visit Adobe's Web site to download the version appropriate to your operating system. For more information, consult the help file linked below.

  We suggest that you print the PDFs in color, then cut-and-paste the appropriate pieces of the printouts over the problematic areas on the original atlas charts.

  We apologize for any inconvenience these errors may have caused.