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Description: | 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 a slider moves in the grooved rim of the meridian ring. The latitude scale is divided clockwise [0�]-90�. On the obverse side and the inner-rim of the equinoctial ring are hour scales. There is a date scale, but no zodiac scale, and the equinoxes are marked at 11 March and 12 September. The gnomon has a pinhole at either end with central concentric lathe-turned circles overlapping the bridge bars. Apart from the unusual double-pinhole gnomon, this dial is typical of those being produced in England in the middle of the 18th century.
For more information regarding this dial please refer to the OUP & NMM catalogue, 'Sundials at Greenwich'.
caption: Universal equinoctial ring dial | Publisher: | "http://collections.rmg.co.uk/" | Rights holder: | "Royal Museums Greenwich" | Subjects: | Directional dial ring dials Sundials at Greenwich Two-ring universal equinoctial ring dial Equinoctial dial universal equinoctial dials | Source: | Royal Museums Greenwich | Identifier: | http://collections.rmg.co.uk/collections... | Go to resource |
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