
thumb|Equatorium from Johannes Schöner
thumb|Equatorium from Johannes Schöner
An equatorium (plural, equatoria) is an astronomical calculating instrument. It can be used for finding the positions of the Moon, Sun, and planets without arithmetic operations, using a geometrical model to represent the position of a given celestial body.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).