Universal Equinoctial Ring Dial Instructions

An universal ring dial first part of the 18th century crafted of brass 9 2 cm in overall diameter.

Universal equinoctial ring dial instructions.

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. The latitude scale is divided clockwise 0 90. 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. The inner rim of the equinoctial ring has an hour scale while the.

A universal equinoctial ring dial is a portable version of an armillary sundial and was inspired by the mariner s astrolabe. In its simplest form the style is a thin slit that allows the sun s rays to fall on the hour lines of an equatorial ring. A universal ring dial or equinoctial ring sundial. This is a reproduction of a universal equinoctial ring dial invented by the brilliant english mathematician william oughtred 1575 1660 this ring dial is a sundial that in theory can be used universally to determine the time in almost any part of the world.

Universal equinoctial ring dial for latitudes 0 90 north. 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. Standard dial see related terms except for the following details the dial is for northern latitudes only. A slider moves in the grooved rim of the meridian ring and has a pointer to indicate the latitude.

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. I found a universal equinoctial sun ring dial for sale at grand illusions this particular version is about 3in across. Its clearly one of the few still being made and appears for sale at a number of different places. This is a relatively example of the classic pendant ring dial useable anywhere on earth and without the need for a compass.

Universal equinoctial sun ring dial then i found another interesting pocket sundial. Three ring universal equinoctial ring dial for all latitudes. It is closely related to the armillary sphere because similar to this it depicts the surrounding firmament with its rings.