getæl-circul, m.n: a cycle for computation. (yeh-TAEL-CHIR-kull / jɛ-ˈtæl-ˌ tʃɪr-kʌl)

A circular diagram from a medieval manuscript with tapering columns of Roman numerals in concentric rings.
Miscellany of works on computus and astronomy; France (Lyon), 11th century; British Library, Sloane MS 263, f. 47v. []

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