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English: Inscriptions on the Antikythera mechanism. (a) FRONT COVER: Planet cycles9,12, framed by moulding from Fragment 3 (Supplementary Fig. S5). FRONT PLATE: Parapegma1,2,25, above and below the Cosmos Display, indexed to the Zodiac Dial. BACK PLATE: Month names on the Metonic Calendar4,8. Eclipse characteristics, round Metonic Calendar and Saros Eclipse Prediction Dials7,8—indexed to the latter. Eclipse glyphs indexed to the Saros Dial8. BACK COVER: User Manual, including Cosmos description9,13 (Supplementary Discussion S2), Calendar Structure8 and Moon-Sun Cycles1,2. (b) Front Cover Inscription (FCI): composite X-ray CT from Fragments G, 26 and 29 and other small fragments9,12. The FCI describes synodic cycles of the planets and is divided into regions for each planet in the CCO (Supplementary Discussion S2). The numbers ΨΞΒ (462) in the Venus section and ΨMΒ (442) in the Saturn section are highlighted12 (Supplementary Fig. S4). (c) Back Cover Inscription (BCI)13 (Supplementary Discussion S2): composite X-ray CT from Fragments A and B. A User Manual: the upper part is a description of the front Cosmos Display9 with planets in the CCO; in red are the planet names as well as the word KOΣMOY—“of the Cosmos”.