Eleven Moon Phases in Folio 86v?

[Dobri]

Yes, but is there some sort of historical context for the use of these ideas in the 15th century?

Due to the You are not allowed to view links. Register or Login to view. during the 15th century, it is possible that old manuscripts (including numerological ones) from the Greek territories were preserved by retreating Europeans and found their way to Venice, the Old Swiss Confederacy, France and Germany. 

Perhaps some numerological aspects (11, 22, and 33 are known as Master Numbers) of the number 11 were known to the author(s) of the cipher manuscript.