This outstanding brass universal equinoctial ring dial the meridian ring divided 90 0 70.
Universal equinoctial ring dial.
A universal equinoctial ring dial sometimes called a ring dial for brevity although the term is ambiguous is a portable version of an armillary sundial or was inspired by the mariner s astrolabe.
Its clearly one of the few still being made and appears for sale at a number of different places.
The ring dial is divided into sectors south 90 degrees to north 90 degrees and divided into months and further calibrated into 24 hours with an adjustable calendar calibrated into 12 months.
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The inner rim of the equinoctial ring has an hour scale while the.
This item will ship to united states but the seller has not specified shipping options.
I found a universal equinoctial sun ring dial for sale at grand illusions this particular version is about 3in across.
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Three ring universal equinoctial ring dial for all latitudes.
Universal equinoctial sun ring dial then i found another interesting pocket sundial.
Standard dial see related terms except for the following details the dial has bracket slides in grooves in the outer edge of the meridian ring and an engraved arrow on the bracket acts as a latitude indicator.
A ring dial or two ring universal equinoctial ring dial to give it its full name was a cutting edge scientific instrument in its time which is about 500 years ago.
The universal equinoctial ring dial is 2 1 2 in diameter.