month names

[Aga Tentakulus]

This is probably the best argument in favor of some calendar aspect. But then again, why did this person need to add the month names if they were already in the know? Maybe they had difficulties remembering which month belonged to which image?

Which month belongs to Leo as an example?

On average, the Sun is in this sign between 24 July and 23 August. Due to the migration of the vernal equinox, the sign of the zodiac Leo no longer corresponds to the constellation Leo. The Sun is in the constellation Leo approximately between 11 August and 17 September.

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What about the postponement?
And where was it in the Middle Ages around 1400?