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.

Engraved at each end of the bridge on both sides are stylised fleur-de-lys. The usual zodiac scale on the bridge is here replaced by one giving the hour of sunrise and sunset for different times of the year. A zodiac scale, accompanied by a date scale, appears on the equinoctial ring of the dial. It is signed '17 William Parsons 59' on the obverse side of the equinoctial ring.

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