👉 The term "cyrtometer" is a name given to a type of astronomical instrument used for observing the positions and movements of celestial bodies, such as stars and planets. This device was first discovered in 1608 by French astronomer Jean-Baptiste Le Verrier de Saint-Gilles. The cyrtometer consisted of two telescopes arranged so that they formed an inverted cone, with a large aperture at one end for the eye to focus on the celestial body being observed.
