Circinus
- Abbreviation:
- Cir
- Genitive:
- Circini
- Translation:
- The Compasses
- Right Ascention:
- 15h 0m
- Declination:
- -60°
Named for the drafting tool used for making circles or arcs. Because it is used in the art of masonry, it (with close constellation Norma, the square) is half of the symbol of Freemasonry.