Astronomical clock, 19th century

Astronomical clock, 19th century

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Credit: KING'S COLLEGE LONDON/SCIENCE PHOTO LIBRARY

Caption: Astronomical clock. 19th-century diagram of the dial-plate of an astronomical clock, showing the daily motions of the Sun, Moon and stars. The outer ring gives the hours of the day in Roman numerals. Next is the approximately 29.5 days of the lunar cycle. Two pointers are labelled with the Sun and Moon, and rings show the twelve months and signs of the zodiac. At centre around the Earth are the ecliptic, horizon, equinoctial, tropic of Cancer, and tropic of Capricorn. Diagram from 'The Works of James Ferguson, F.R.S.' (1823) containing works by Scottish astronomer and instrument maker James Ferguson (1710-1776).

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Keywords: 1800s, 1823, 19th century, 24 hours, 29.5 days, annual, artwork, astronomical, astronomical clock, astronomy, black-and-white, britain, british, clock-face, day, days, device, diagram, dial, earth, ecliptic, equinoctial, european, frs, historical, history, horizon, hour, hourly, hours, illustration, james ferguson, lunar cycle, monochrome, month, monthly, moon, orbit, orbits, physical, physics, planet, roman numerals, scottish, signs of the zodiac, solar cycle, sun, technological, technology, the works of james ferguson, tropic of cancer, tropic of capricorn, twelve months, year, zodiacal

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