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Early astronomical instrument Diagram of huge rings (Johannes Dryander, Annulorum trium diversi generis ..., published Marburg, 1537) Astronomical rings (Latin: annuli astronomici), likewise understood as Gemma's rings, are an early huge instrument. The instrument includes three rings, representing the celestial equator, declination, and the meridian. Answers Shown Here can be utilized as a sun dial to inform time, if the approximate latitude and season is understood, or to tell latitude, if the time is understood or observed (at solar noon).

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History [edit] Parts of the instrument go back to instruments made and utilized by ancient Greek astronomers. Gemma Frisius combined numerous of the instruments into a little, portable, astronomical-ring instrument. He first released the style in 1534, and in Petrus Apianus's Cosmographia in 1539. These ring instruments integrated terrestrial and celestial computations.

Traveller's sundial or universal equinoctal ring dial [edit] The dial is suspended from a cord or chain; the suspension point on the vertical meridian ring can be changed to match the local latitude. The time reads off on the equatorial ring; in the example below, the center bar is twisted till a sunray travels through a little hole and falls on the horizontal equatorial ring.