It's a Volvelle..
Layer 1: The Outermost Rim (The Winds & Directions)These Latinized Greek terms served as the compass points of the medieval Mediterranean world, anchoring the chart geographically.bozeas (Boreas) → The North Wind / Northaquilo (Aquilo) → The Northeast Wind / Northeastsubsolan⁹ (Subsolanus) → The East Wind / Eastvulturn⁹ (Vulturnus) → The Southeast Wind / Southeastauster (Auster) → The South Wind / Southnotus (Notus) → The South-Southwest Windafric⁹ (Africus) → The Southwest Wind / Southwestfavoni⁹ (Favonius) → The West Wind / West
Layer 2: The Outer-Middle Rungs (The Time Buffers)These wide cells dictate the base math for the alignment of the sun and the moon.30 and 29 → Triginta et viginti novemTranslation/Purpose: "Thirty and twenty-nine." These alternate around the circle to represent the changing lengths of standard calendar months, or the 29.5-day synodic lunar month.
Layer 3: The Inner-Middle Columns (The Metonic Grid)These narrow, radiating boxes are filled with fluctuating Arabic numerals used by scholars to calculate moveable Christian holidays.19 / 12 / 11 / 10 / 16 / 20 / 23 / 24 → Numeri ComputiTranslation/Purpose: "Computus Numbers."19 represents the 19-year Metonic Cycle (the time it takes for moon phases to land back on the exact same solar calendar dates).11 is the Epact (the 11-day yearly deficit between a 365-day solar year and a 354-day lunar year).
Layer 4: The Inner Rings (The Calendar Tracker)This layer tracks the physical trajectory of the months across the seasons.ap[ri]l[is] → AprilIun[ii] → June
Layer 5: The Center Hub (The Core Cosmos)The absolute innermost axis lines and astronomical glyphs that orient the entire chart.orient (Oriens) → The East / Sunrise (used as the primary alignment baseline)occident (Occidens) → The West / Sunset\(\hbar \) (Saturnus) → Saturn (representing Chronos, deep cosmic time)\leftmoon (Luna) → The Moon (the primary engine driving the calculations of this wheel)
Layer 1: The Outermost Rim (The Winds & Directions)These Latinized Greek terms served as the compass points of the medieval Mediterranean world, anchoring the chart geographically.bozeas (Boreas) → The North Wind / Northaquilo (Aquilo) → The Northeast Wind / Northeastsubsolan⁹ (Subsolanus) → The East Wind / Eastvulturn⁹ (Vulturnus) → The Southeast Wind / Southeastauster (Auster) → The South Wind / Southnotus (Notus) → The South-Southwest Windafric⁹ (Africus) → The Southwest Wind / Southwestfavoni⁹ (Favonius) → The West Wind / West
Layer 2: The Outer-Middle Rungs (The Time Buffers)These wide cells dictate the base math for the alignment of the sun and the moon.30 and 29 → Triginta et viginti novemTranslation/Purpose: "Thirty and twenty-nine." These alternate around the circle to represent the changing lengths of standard calendar months, or the 29.5-day synodic lunar month.
Layer 3: The Inner-Middle Columns (The Metonic Grid)These narrow, radiating boxes are filled with fluctuating Arabic numerals used by scholars to calculate moveable Christian holidays.19 / 12 / 11 / 10 / 16 / 20 / 23 / 24 → Numeri ComputiTranslation/Purpose: "Computus Numbers."19 represents the 19-year Metonic Cycle (the time it takes for moon phases to land back on the exact same solar calendar dates).11 is the Epact (the 11-day yearly deficit between a 365-day solar year and a 354-day lunar year).
Layer 4: The Inner Rings (The Calendar Tracker)This layer tracks the physical trajectory of the months across the seasons.ap[ri]l[is] → AprilIun[ii] → June
Layer 5: The Center Hub (The Core Cosmos)The absolute innermost axis lines and astronomical glyphs that orient the entire chart.orient (Oriens) → The East / Sunrise (used as the primary alignment baseline)occident (Occidens) → The West / Sunset\(\hbar \) (Saturnus) → Saturn (representing Chronos, deep cosmic time)\leftmoon (Luna) → The Moon (the primary engine driving the calculations of this wheel)
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