As previously posted on Cloudy Nights:

From today until Christmas complimentary Clear Skies Observing Guides (CSOG) editions are available with the purchase of a constellation edition:


  • Purchase any 5-6" edition and get a complimentary Messier or Caldwell edition. Discount code: CN5-6MC
  • Purchase any 8-10" edition and get a complimentary Herschel 400, Herschel II or Dunlop edition. Discount code: CN8-10HD
  • Purchase any 12" edition and get a complimentary Messier or Caldwell and a Herschel 400, Herschel II or Dunlop edition. Discount code: CN12MCHD


Add both the constellation edition and the complimentary one to your shopping cart, enter the discount code and pay only for the constellation edition.
As for all CSOG content, give the image orientation some thought before finalizing your order. If you have any questions, please feel free to PM or e-mail me.