Bonmont Psalter, Besançon. Bibliothèque municipale, Ms. 54

[Pierre Dumont Himself]

The addition of the sun is thus perfectly logical: each sign is active while the sun passes through it.

 
From the description of the Leardo Maps, posted on the other thread:

The second circle shows the names of the months, beginning with March, which was officially reckoned the first month of the year in the Republic of Venice until as late as 1797; it also tells the day, hour, and minute when the sun enters each of the twelve signs of the zodiac.

 
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Such a depiction does indeed appear unremarkable even if it is rare. Now we need to find one with writing in it.