Universal Equinoctial Ring Dial

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.

Universal equinoctial ring dial.

Seller assumes all responsibility for this listing. Three ring universal equinoctial ring dial for all latitudes. The universal equinoctial ring dial is 2 1 2 in diameter. Its clearly one of the few still being made and appears for sale at a number of different places.

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. Universal equinoctial ring dial franklin mint with mahogany base. This item will ship to united states but the seller has not specified shipping options. 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.

It was likely invented by william oughtred around 1600 and became common throughout europe. 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. This outstanding brass universal equinoctial ring dial the meridian ring divided 90 0 70. Essentially it is a type of sundial that allows you to tell the time wherever you are so long as the sun is shining originally developed in the early 17th century by the.

I found a universal equinoctial sun ring dial for sale at grand illusions this particular version is about 3in across.