Ephemerides

Ephemerides are tables or data that predict the positions of celestial objects—such as planets, stars, the Moon, or the Sun—at specific times. They are used by astronomers, navigators, and spacecraft planners to determine where these objects will be in the sky on particular dates and times. Essentially, an ephemeris provides a detailed celestial roadmap, allowing users to locate objects accurately for observation, navigation, or scientific purposes. They result from precise calculations based on astronomical observations and models, and are essential for understanding the movement of celestial bodies over time.