astronomical rings

astronomical rings is a sundial or astronomical instrument.

Also recorded as Gemma's rings; universal equinoctial sundial; universal equinoctial ring; equinoctial ring.

Overview

The record gives 1530 as its date of establishment or first appearance. Catalogue entries for instruments state maker, signature, completeness and working condition. VALÉORINE records this subject so that lots referring to it can be described consistently.

In detail

early astronomical instrument

Sources

Each source is named with the standing the house places on it, so the evidence can be weighed rather than taken on trust.

reference work · Reputable secondary · Wikipedia
“Astronomical rings”, English Wikipedia, consulted as further reading
Consult the source
reference work · Reputable secondary · Wikidata
Wikidata, structured authority record Q1583214: astronomical rings
Consult the source