One plate of an astrolabe. The usual stereographic projection (with unequal hour lines and the 12 astrological houses for latitude 43 degrees ? 40'.

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One plate of an astrolabe. The usual stereographic projection (with unequal hour lines and the 12 astrological houses for latitude 43 degrees ? 40'. Wellcome Collection. Attribution 4.0 International (CC BY 4.0). Source: Wellcome Collection.