זמן ומדידה

The Byzantine Sundial-Calendar as a Portable Geared Lunisolar State Computer

תוכן האובייקטים עצמם כתוב באנגלית ועדיין לא תורגם.

תקופה ומקור

Byzantium, conventionally dated 400-600 CE; the most important surviving geared device between Antikythera and the medieval traditions

מה הוא נבנה לעשות

To carry a predicted calendrical state and an observed local time in one portable instrument, for any of sixteen named places.

כיצד המנגנון פועל

A sundial plate, a suspension element, a lunar disc with gear and an arbor carrying a ratchet and gears survive. Gear trains map calendrical state to annual solar longitude and lunar phase; the sundial independently maps solar illumination to local time for a chosen latitude.

קלט

A manual calendrical advance, and the Sun itself for the dial.

טרנספורמציה

Geared mapping of calendar state to solar longitude and lunar phase, alongside an independent optical mapping of illumination to local hour.

פלט

Lunisolar state and local time, together, for a selected geographic setting.

מה מבוסס בראיות

מבוסס: הממצא או התיעוד נושאים זאת במישרין.

מה הוא מדגים

A prediction and a measurement of the same world, carried side by side - and an honest gap, because the exact coupling between the two functions does not survive.

כל המנגנונים