1A work describing the heavens and especially the stars, giving their positions, magnitudes, etc. Compare uranoscopy . Now chiefly historical.
2The measurement and recording of the distances and positions of celestial objects, especially the stars; the branch of astronomy concerned with this (now more often called astrometry).
Mid 17th century; earliest use found in John Sadler (1615–1674), political theorist and reformer. From urano- + -metry, after post-classical Latin uranometria uranometria.