I am a HUGE fan of the Ghosts of Saltmarsh book. Love it to pieces. All sorts of goodness there. But, one thing that has always bugged me was the Saltmarsh map:
I hate that the map is set with North to the left of the map. It's always been a sort of proud nail thing that just annoyed me. But, I could never really understand why it bothered me. So, I was looking at the map, and it hit me.
Look at the shadows.
All the shadows of the building are to the right of the map. IOW, the sun is on the left - either morning or afternoon, we can't really know which. But, that means that Oerth's orbit is wonky as all hell. The sun rises (or sets - again we cannot know from this map) in the north. This means that Greyhawk's polar ice caps are in the east and west,. All the descriptions of the climate printed before has just been retconned. You can't have a cold north when the planet is tilted 90 degrees to what our Earth is.
This just blew my mind. It's a wonder that no one has twigged to this before.