PERPETUAL CALENDAR / LUNAR CALENDAR, English, 19th century, made of brass 1-1/2″ (3.7 cm) in diameter. One side has a rotating disk marked “Day of the Month For Ever,” with a smiling sunface and a ring of month dates. This reads against a fixed ring of weekdays. The other side has a volvelle marked “Moon’s Age, Phases, and Southings,” with circular scales of twice-12 hours, date of the lunar month, and weekdays. An eccentric circle indicates fullness of the
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