e/Astronomical rings

Information
has gloss	eng: Astronomical rings (Latin: annuli astronomici) , also known as Gemma's rings, are an early astronomical instrument. The instrument consists of three rings, the meridien, the equator, and the declination ring. It may be considered to be a simplified, portable armillary sphere, or a more complex form of astrolabe.
lexicalization	eng: Astronomical rings
instance of	(noun) timepiece that indicates the daylight hours by the shadow that the gnomon casts on a calibrated dial sundial