Are the 1430s the most likely date range for the Zodiac drawings?

[davidjackson]

Years ago I wrote this bit about the human crossbowman of Sagittarius:
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Note that since this article was written quite a bit more research has been published!
But if you look at the image provided by MarcoP showing the 8 crossbowmen, all drawn at different stages across the century, you can clearly see how the imagery developed from the late 14th century flowing style to a much more realistic style at the end of the following century.