nends: Petrus Apianus - Astronomicum Caesareum - Ingolstadt, 1540 volvelle - medieval instrument con
nends: Petrus Apianus - Astronomicum Caesareum - Ingolstadt, 1540 volvelle - medieval instrument consisting of a series of concentric rotating disks, used to compute the phases of the moon and its position in relation to that of the sun -- source link
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