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Astronomical rings
Astronomical rings (Latin: annuli astronomici),〔(【引用サイトリンク】url=http://www.mhs.ox.ac.uk/students/98to99/Inst/Instpgs/2a.Gemmasrings.html )〕 also known as Gemma's rings, are an early astronomical instrument. The instrument consists of three rings, the meridian, the equator, and the declination ring. It may be considered to be a simplified, portable armillary sphere, or a more complex form of astrolabe.
Gemma Frisius was the designer of the astronomical rings in the 16th century. He was known as a physician, mathematician, cartographer, philosopher, and instrument maker. He created important globes, improved the mathematical instruments of his day and applied mathematics in new ways to surveying and navigation.
==The Rings==
These three rings are self-orienting. When the shadow of the rings are aligned so that they appear to be in the same, or nearly the same, place, the meridian identifies itself.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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