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. A slider moves in the grooved rim of the meridian ring, on which is a degree scale divided anticlockwise from top 0°-[90°]. The reverse side has acanthus leaves engraved at the quadrant points and there is no altitude quadrant. On the equinoctial ring, there are two hour scales: a main one on the obverse side and another on the inner-rim. The reverse is decorated with wheatsheaf engraving. Date and zodiac scales are also displayed, but there is no declination scale. The equinoxes are given as 19 March and 20 September. The bridge has elaborately shaped ends.

The use of two different metals (silver for the equinoctial ring, brass for the remainder) is very unusual, as is the shape of the ring carrying the suspension piece. The work is generally finer on the decoration than on the divisions, particularly those on the bridge. The style of engraving suggests a Dutch origin.

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