Ephemeris

Brightness (magnitude), distance from the Sun or Earth, velocity, and apparent diameter.

Historically used by mariners to find their way at sea, ephemerides remain a vital backup to modern satellite systems.

Modern GNSS signals transmit "broadcast ephemeris" data. This contains precise orbital parameters that your phone or car's GPS receiver uses to calculate the satellite’s exact position, allowing it to determine your location on Earth. Ephemeris

An ephemeris provides more than just a location in the sky. Scientific versions often include:

While printed almanacs are still produced for emergency use, most professionals use electronic datasets: Ephemeris - an overview | ScienceDirect Topics Brightness (magnitude), distance from the Sun or Earth,

Usually given in spherical polar systems (Right Ascension and Declination).

Astrologers use these tables to track planetary "transits" (the movement of planets through zodiac signs) and generate birth charts. Scientific and Technical Data This contains precise orbital parameters that your phone

An (plural: ephemerides ) is a tabulation of the computed positions and velocities of celestial bodies—such as planets, moons, asteroids, and satellites—at specific dates and times. Derived from the Greek word for "diary," it serves as an itinerary for astronomical objects, providing essential data for navigation, scientific research, and astrology. Core Applications