Universal equinoctial ring dial

Universal equinoctial ring dial for latitudes 0°-90° North. Standard dial (see related terms) except for the following details:-

The dial is for northern latitudes only and the latitude is indicated by a central line on the bracket. The degree scale on the meridian ring is divided clockwise [0°]-[90°] and the remainder of the obverse side carries a table of latitudes which is continued on the reverse. There is a date scale but no zodiac or declination scale and the equinoxes are marked at 20 March and 20 September.
There is an intricate acanthus decoration on the equinoctial ring stops, bridge pivots and bridge ends. The placement of Lyon in the table of latitudes, which interrupts the generally alphabetical list of (mostly) French towns, might suggest that the original owner was from this city. It is signed 'Butterfield AParis' on the obverse side of the meridian ring.

For more information regarding this dial please refer to the OUP & NMM catalogue, 'Sundials at Greenwich'.

Object Details

ID: AST0269
Collection: Astronomical and navigational instruments
Type: Universal equinoctial ring dial
Display location: Not on display
Creator: Butterfield, Michael
Date made: 1675-1715
Credit: National Maritime Museum, Greenwich, London, Caird Collection
Measurements: Overall: 4 x 128 mm

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