Rare Regiomontanus dial, brass, France, second half of the 17th century, with an exceptional and enigmatic calculating device probably used for determining the phases of the moon

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With a moveable calculating device for lunar phases The brass plate, measuring approximately 6 x 9.5 cm, is mounted with a three-segment brochiolus of blackened brass, supporting a plumb line with lead weight. It is engraved with a triangular grid of latitudes (15°-65°, every 5°), dates (1 December to 31 May, divisions each third of a month), parallel hour lines ("Heures devant Midi" from midnight to noon, and "Heures après Midi", from noon to midnight, graduated every hour), and a shadow square with hachured scale (0-12 twice, divisions every one fifth). This remarkable sundial has an exceptional feature : the reverse bears a complex system of brass sliders which looks like some sort of abacus for calculating the lunar phases. Quality is very high, and condition is very fine. N° de ref. del artículo 3870

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Título: Rare Regiomontanus dial, brass, France, ...