[A New Astronomical Instrument Shewing the Day of the Month, Change and Age of the Moon, the Places of the Sun and Moon in the Ecliptic, with the times of the rising, southing and setting of the Sun, Moon and Stars to the first, second and third Magnitude, from A.D. 1756 to 1805 inclusive.]
Ferguson, James,1710-1776.
Mynde, J.,active 1740-1770,engraver.
[London : John Ferguson,
circa 1756]
The middle disk from an astronomical rotula which would have originally comrprised 2 volvelles attached to a back sheet; this one depicts a celestial chart.
Astronomical instruments