10 Euros Ptolemy's Astrolabe

Issuer	Bank of Greece
Year	2025
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Composition	Silver (.925)
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Obverse description	The obverse depicts a stylised plan view of Ptolemy's astrolabe rendered in high relief, its concentric graduated rings, rete projections, and alidade arm radiating dynamically across the field. At the centre, a circular medallion bears the Greek national coat of arms — a white cross on a blue shield encircled by a wreath — surrounded by the legend ΕΛΛΗΝΙΚΗ ΔΗΜΟΚΡΑΤΙΑ and the denomination 10 ΕΥΡΩ. The outer rim is bounded by a finely milled border with a toothed scale referencing the instrument's degree markings. The overall design evokes the precision and geometry of ancient astronomical instrumentation.
Obverse script	Greek
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Reverse description	The reverse features a three-dimensional armillary sphere or celestial globe rendered in colour, its intersecting great circles — meridian, equator, ecliptic, and colures — picked out in gold-coloured selective colouring against a mirror-polished silver field. The date 2025 appears within the upper arc of the globe. A small mint mark is visible in the central field. The surrounding legend, inscribed along the inner rim, reads ΑΡΧΑΙΑ ΕΛΛΗΝΙΚΗ ΤΕΧΝΟΛΟΓΙΑ at the top and Ο ΑΣΤΡΟΛΑΒΟΣ ΤΟΥ ΠΤΟΛΕΜΑΙΟΥ at the bottom, separated by the globe motif. The composition celebrates Ptolemy's contribution to ancient Greek astronomical science.
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