Astrologers use these tables to track planetary "transits" (the movement of planets through zodiac signs) and generate birth charts. Scientific and Technical Data
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: Astrologers use these tables to track planetary "transits"