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"Astronomy and calendars" is a cross-disciplinary book category covering the science of celestial bodies and the human systems for measuring and organizing time. It includes popular and technical treatments of observational and theoretical astronomy (stars, planets, solar and lunar motion, ephemerides, celestial mechanics), practical guides such as star charts, almanacs and sky‑watching manuals, and works on timekeeping technologies. Equally prominent are histories and comparative studies of calendar systems (Gregorian, Julian, lunar, lunisolar, religious and regional calendars), their cultural and agricultural roles, and the astronomical calculations and algorithms used to convert dates and predict events. Books in this category range from introductory guides and field handbooks to academic monographs and reference works intended for historians, astronomers, navigators, and anyone interested in how celestial motion governs time and human activity.

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