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Ephemerides, as a book category, encompasses date‑ordered reference works and daily records that track or predict phenomena over time. At its core is the traditional ephemeris—a table listing the positions of celestial bodies—so the category includes astronomical and astrological ephemerides, nautical and air almanacs, and tide tables. More broadly it extends to almanacs, calendars, daybooks, logbooks, and observational journals that present information indexed by day or moment. These works are typically issued periodically (often annually), emphasize precision and timing, and serve practical purposes such as navigation, observation, planning, ritual, or research. While their utility is time-bound to a specific span, they also function as historical records when preserved.

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