Product images of Universal equinoctial ring dial
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Manufactured in the UK
All products are printed in the UK, using the latest digital presses and a giclée printmaking process.
We only use premium branded inks, and colours are independently verified to last between 100 and 200 years.
Universal equinoctial ring dial
Universal equinoctial ring dial for latitudes 0â”œÃ—_-90â”œÃ—_ north. 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 [0â”œÃ—_]-90â”œÃ—_. 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.
- Image reference: D8815
- National Maritime Museum, Greenwich, London