'P' is the key

[eggyk]

For anyone curious what a full at-scale overlay would look like between VM p68 & 'Map with Ship'

When you say full scale, have you used the actual true scale of both pages to do this? You appear to have effectively sized the "map with ship" parchment and f68 to have the same total height, which isn't correct. 

The map with ship vellum is 29cm high x 41cm wide, while You are not allowed to view links. Register or Login to view. is ~22.5cm high. So it would be more like this (my best attempt): 

       

I've tried lots of different orientations, but there is not obvious lining up of features between the both (folds, creases, marks etc). You can always make 1 or 2 things line up, no matter the orientation, but never everything. 

As for the clock idea, its interesting, but i'm not sure how the stars on the inside come into that. On reddit you stated that they represent night, i think? If so, how can the full circle represent 24hrs if night is represented in each of the 12 sections? Surely then you are representing 12 days instead, with blue representing the day sky, the red representing sunset, and the stars the night sky. 

View each spike/point as an indication of an hourly mark; there are 12 in total like a clock. 
--Assuming it functions on 2 twelve-hour cycles (indicated by the Solar/Lunar imagery and the accompanying Mongolian (?) 4-point 'full stop' at the 12 o'clock position) 

Why not assume one 24 hour cycle, with each segment representing 2 hours? If you assume a 12 hour system, are you assuming an area/time/date that has the moon dissapear for 3 hours per day, and then a night lasting 3 hours? 

If you are doing this, you must assume that it begins from sunrise and goes clockwise. That means the first three hours of daylight must have no moon (3am-6am), then the moon is visible for 9 hours (6am-3pm), after that the moon becomes invisible for 3 hours (3pm-6pm), then becomes visible again for 9 hours (6pm-3am).

If you assume it begins at sunset, the moon is visible at all times other than 12pm-3pm, and the sun is visible at all times other than 12am-3am. 

If you assume a 24 hour system beginning at sunrise at 4am, the sun would always be visible and the moon would be visible for 18 hours per day (only during the day, not at night)
If you assume a 24 hour system beginning at sunset at 10pm, you would have he moon visible 24 hours a day, and a night time period of around 10pm-4am. 

Does somewhere in the arctic, or anywhere else, match any of these patterns?