Universal equinoctial ring dial

D8834

Universal equinoctial ring dial Long Caption: Universal equinoctial ring dial for 0°-90° North. Standard dial (see related terms) except for the following details: the dial is for northern latitudes only and the latitude scale on the obverse side of the meridian ring is divided clockwise from top N0r-[90°]. The hour scale on the obverse side of the equinoctial ring is depicted on a scroll and there is also an hour scale on the inner-rim. On the reverse is a zodiac scale along the inner edge and a date scale on the outer edge. The equinoxes are marked at 19½ March and 22½ September. There is also a scale for sunrise and sunset and a declination scale. Credit line: © National Maritime Museum, Greenwich, London, Gabb Collection Object: AST0401 Artist: William Parsons Date: 1759 Medium: brass Size: 3 mm x 91 mm Click here to buy a bespoke print of this image.