Purchasing your CSOG edition(s)

The Special editions as listed above include tours depending on the edition, but always include an AstroPlanner planfile:

• the Messier catalogue is available sequentially (no tours), by constellation (with tours) or sorted for a Messier marathon (no tours)
• the Lacaille catalogue is available sequentially (no tours) or by constellation (with tours)
• the Dunlop catalogue, by constellation, tours included
• Herschel 400, by constellation, tours included
• Herschel II, by constellation, tours included
• the Caldwell list is available sequentially (no tours) or by constellation (with tours)
• the Bennett list is available sequentially (no tours) or by constellation (with tours)
• Palomar Globular Clusters, sequentially (no tours) or by constellation (with tours)
• Terzan Globular Clusters, sequentially (no tours) or by constellation (with tours)
• Hickson Compact Galaxy Groups, one guide for each of the Hickson groups, tours included
• Carbon Stars, globular clusters or planetary nebulae are available by constellation, by telescope aperture (5-6", 8-10" or 12") and in either the All Sky or hemisphere editions, tours included. There is no separate southern edition for globular clusters.

Choosing Your Edition(s)

All of the CSOG editions are available in four image orientation editions:

• True - unmirrored: North up, east to the left
• Mirrored horizontally - M_H : North up, west to the left
• Mirrored vertically - M_V : South up, east to the left
• Mirrored horizontally & vertically - M_HV : South up, west to the left

When selecting your edition(s) you will be asked to choose the image orientation of the content you selected. Please give this some thought before finalizing your order.
If you are in doubt whether or not your telescope mirrors, observe a fixed object in daytime and compare the naked eye view to that in your eyepiece.

If you previously purchased a CSOG edition, you can purchase the same edition in a different image orientation edition for 25% of the original price (a 75% discount). If you wish to do so, please contact me by e-mail after the initial purchase for your discount code.

Downloading CSOG

After completing the purchasing process by payment in PayPal, you will receive a download link by e-mail. Click on this link to download purchased content. Please make sure the e-mail did not end up in your spam folder.
To prevent piracy as much as possible CSOG download links expire after a while.

All CSOG editions come in zipfiles. Please ensure the download proceeds uninterrupted. If you have a relatively slow internet connection (<5 Mbit) you may want to let it run overnight. Extracting the zipfile(s) will take a few minutes.
Once a zipfile is extracted you will find a folder containing all of the edition's content. It is up to you how to sort and store the files. Keeping them organized in constellation folders or a separate "Specials" folder is recommended.

If you have a slow or intermittent internet connection, please take note of the following:

• Instead of using WiFi, use a wired (ethernet) connection to ensure an uninterrupted network signal.
• When downloading an edition with multiple files, download the files one at a time.
• Use a browser that automatically resumes an interrupted download. Use of Google's Chrome is highly recommended: The CSOG server supports resuming downloads, some browsers do not.
• MS Windows users are encouraged to use Free Download Manager, a free application that will automatically resume an interrupted download.
• If your connection is very, very slow and/or intermittent, please try using a faster connection at another location.