KING'S COLLEGE LONDON / SCIENCE PHOTO LIBRARY KING'S COLLEGE LONDON / SCIENCE PHOTO LIBRARY
Astronomical clock. 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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