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 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 â”œÃ²_ March and 11 September and there is a wheatsheaf pattern along the outer edges of the bridge bars.
- Image reference: F2106-2
- National Maritime Museum, Greenwich, London