I am not aware of any particular reason to assume that the writing in the margin of You are not allowed to view links. Register or Login to view. is Occitan.
There was a time that the month names in the zodiac section were considered to be Occitan, but there are two problems with that:
1) the hand of the zodiac month names is quite different from that on f.17r
2) the language of the zodiac month names is much more likely to be northern French than Occitan.
For point 2: Occitan could explain the (doubtful) reading of Marc (with cedilla) for March. However, this could easily be read as Mars (i.e. ending with s).
Northern French explains several month names. I already pointed to the most convincing argumentation several times:
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There was a time that the month names in the zodiac section were considered to be Occitan, but there are two problems with that:
1) the hand of the zodiac month names is quite different from that on f.17r
2) the language of the zodiac month names is much more likely to be northern French than Occitan.
For point 2: Occitan could explain the (doubtful) reading of Marc (with cedilla) for March. However, this could easily be read as Mars (i.e. ending with s).
Northern French explains several month names. I already pointed to the most convincing argumentation several times:
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