Universal Equinoctial Ring Dial Instructions

The function of the hour ring turn it into a position rectangular to the meridian ring and then back into the universal sundial ring the universal sundial ring is the queen of all sundials.

Universal equinoctial ring dial instructions.

Three ring universal equinoctial ring dial for all latitudes. A universal equinoctial ring dial is a portable version of an armillary sundial and was inspired by the mariner s astrolabe. An universal ring dial first part of the 18th century crafted of brass 9 2 cm in overall diameter. It comprises two rings namely a meridian ring engraved with scales of latitude and a.

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. Standard dial see related terms except for the following details the dial is for northern latitudes only. 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. 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 latitude scale is divided clockwise 0 90. The inner rim of the equinoctial ring has an hour scale while the. It was likely invented by william oughtred around 1600 and became common throughout europe. Universal equinoctial ring dial for latitudes 0 90 north.

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. It is closely related to the armillary sphere because similar to this it depicts the surrounding firmament with its rings. A slider moves in the grooved rim of the meridian ring and has a pointer to indicate the latitude. I found a universal equinoctial sun ring dial for sale at grand illusions this particular version is about 3in across.

Universal equinoctial sun ring dial then i found another interesting pocket sundial. 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.