CSOG 3.0, published on 29 November 2024, was the last complete revision of the Clear Skies Observing guides: from here on, new editions will be added incrementally and existing content will receive interim updates.
The first CSOG 3.0 interim update was published on 22 September 2025, alongside 9 new editions. Updated content is marked V3.0.1.
With a publication of this magnitude (...), errors are inevitably going to creep up. These will be corrected in due time. If you come across something in CSOG that ought to be corrected, please let me know.
Known issues
Significant errors, inconsistencies, cosmetic issues etc. that were recognized and will be corrected with interim updates to applicable editions:
- Currently, the primary designation for Holmberg Galaxies in CSOG is not "Holmberg I, II, III, etc.". This will be corrected in the next update for the Holmberg Galaxies edition and in any other edition that includes a Holmberg galaxy, a reference to such a galaxy in a field description, in index files, AstroPlanner planfiles and in Tour files. With the sole exception being Holmberg VI (NGC3025A / Helwân 11) in Eridanus.
- Some galaxies have an MCG designation - either the primary designation or a synonym designation - that ends in "-000". As this is not a designation used in the original MCG catalogs, these designations are being removed. This error was introduced by information in the UGC galaxy catalog through AstroPlanner.
- The footers of some (192 of 16343 = < 1.2%) unmirrored observing guides incorrectly indicate the guide is an "MH" (horizontally mirrored) edition.
this page was updated on 24 November 2025
