Months names are all one off?

[nablator]

The source is a medical manuscript collection 1498. 
It contains all the Zodiac signs with explanations why are accepted the finishing months to be attributed to the signs.

I'm not sure of my reading, but it doesn't seem to explain why:

Aries
Hoc signum igneum est [?] continuet finem Marcii s[?] medium Aprilis attribuitur t[ame?]n magis Aprili, quia in eo finitur sorti[?]. Aut [?] nomen Arietis. Quia sic[ut?]...

Then I found a printed Computus Ecclesiasticus that matches (mostly) the rest of the text. It's the same text that René linked, with the same diagram (on the previous page) with zodiac signs and the months offset corresponding with reality.

[Et dicitur Aries, quoniam quemadmodum] Aries est animal, quod in parte anteriori viget, posteriori vero debile est: ita sol existens in illa parte zodiaci, quae Aries dicitur, in tempore hyemali parum habet virtutis scilicet caloris & siccitatis: in parte anteriori magis, scilicet versus aestatem. Vel ut dicitur. Aries tota hyeme sinistro lateri accumbit, aestate vero dextro. Si quidem sol tota hyeme accedit ad inferius hemisphaerium, aestate vero ad superius, quod est quasi latus mundi dextrum.

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