simple lunar volvelle, late 14th c.

a manuscript page with a paper disc attached that rotates around the centre to visualize moon phase
alt text
a manuscript page with a paper disc attached that rotates around the centre to visualize moon phase
source: https://bsky.app/profile...

larger image: https://digital.bodleian.ox.ac.uk/objects...

full reference: MS. Ashmole 210 - https://medieval.bodleian.ox.ac.uk/catalog...

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https://mltshp.com/p/1RSE2

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