Universal equinoctial ring dial for all latitudes. Standard dial (see related terms) except for the following details:-

On the latitude scale, which is divided clockwise from top 0°-90°-0°-90°-0°, 'S' and 'N' are marked either side of the top zero, and there is a scale for determining the solar altitude and zenith distance. On the obverse side and the inner-rim of the equinoctial ring is an hour scale, and the reverse is blank apart from the signature: 'Nat. Witham Fecit.' There is a date scale, a zodiac scale and a declination scale. The equinoxes are marked at 9 ½ March and 11 September and there is a wheatsheaf pattern along the outer edges of the bridge bars.

The use of wheatsheaves as decoration are a common feature on English instruments of the 18th century.

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