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Spherical astronomy is the branch of astronomy that deals with measuring and predicting positions of celestial objects on the sky using the geometry of the celestial sphere. Books in this category cover the mathematical and practical tools for locating stars, planets, the Sun, and the Moon, typically through spherical trigonometry, celestial coordinate systems (horizon, equatorial, ecliptic, galactic), and timekeeping (solar and sidereal time). They explain how to compute and apply observational corrections such as precession, nutation, aberration, refraction, parallax, and proper motion; how to transform between coordinates; and how to generate and use ephemerides. Works may range from textbooks and computational guides to reference manuals for astrometry, telescope pointing, and celestial navigation, with applications in geodesy, satellite tracking, and calendar-making, providing the foundational methods behind positional astronomy.

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