P.9_a_volvella_of_the_moon._A_volvella_is_a_moveable_device_for_working_out_the_position_of_the_sun_and_moon_in_the_zodiac

Volvelle of sun and moon positions

‘Volvella’ of the moon, with moveable device for calculating the position of the sun and moon in the zodiac.
Original in Nat. Lib. of Wales: By Gutun Owain – National Library of Wales, CC0, https://commons.wikimedia.org/w/index.php?curid=44768586

Volvelle of sun and moon positions

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