tables in late medieval Latin astronomy. Although the compilers of the tables assumed the Earth was stationary at the center of the universe, the data in the tables was successfully used by Copernicus in the development of the model in which the Sun is stationary. The Toledan Tables were used in the work of a man by the name of Isaac ben Joseph Israeli of Toledo. He used a collection of various Toledan Tables along with other sources to provide information on eclipses. These eclipses had been observed by R. Isaac ben Sid, who was known as one of the authors of the Castilian Alfonsine Tables. Because of this, it was thought that Isaac ben Joseph would speak about the Alfonsine Tables, however he makes no mention of these tables, instead he references the Toledan Tables. An important characteristic of a few of the Toledan Tables is that they listed the arguments of the planetary positions in half-degrees, making these tables twice as long as other tables which dealt in only full degrees. These arguments were specifically found for Saturn, Venus and Mercury. The Toledan Tables were organized into categories such as: Chronology of eras Trigonometry and spherical astronomy Mean motions of the sun, moon, and planets Planetary latitudes Eclipses Astrology In modern astronomy, tables of movements of astronomical bodies are called ephemerides. These expand upon the ideas of the Toledan tables, and are used with modern computing methods to calculate where any celestial body will be at any point in time in relation to another celestial body. They are updated yearly by NASA to provide the accuracy needed for modern calculations. This expands upon the Alfonsine tables by using an updated analytical solution to the conics of the orbital bodies that more accurately map their orbits. See also Zij (medieval Arabic astronomy tables) Alfonsine tables (produced at Toledo, mostly the original Toledan Tables) Prutenic Tables (first comprehensive heliocentric tables, year 1551) Rudolphine Tables (astronomy tables of Kepler, year 1627) References External links 11th-century books Astronomical tables Astrological texts 11th century in science Astronomical works of the medieval Islamic world Scientific works of Al-Andalus