Swiss Ephemeris Planetary Positions: Daily Tables 1900-2100

What Are Ephemerides?

Our ephemeris pages publish daily planetary positions for the Sun, Moon, Mercury through Pluto, the Mean and True lunar nodes, and the four major asteroids Ceres, Pallas, Juno and Vesta. Every coordinate is rendered through the Swiss Ephemeris library maintained by Dieter Koch and Alois Treindl at Astrodienst, the same engine trusted by tens of thousands of practitioners worldwide. Tropical longitudes are computed against NASA JPL DE441, the lunar and planetary ephemeris distributed by the Jet Propulsion Laboratory, with residuals smaller than ±0.001 arcsecond when compared to JPL Horizons reference output. The tables span 1900 to 2100, which covers nearly every birth chart and forecasting window an astrologer will encounter. Following the analytical tradition that runs from Ptolemy and Vettius Valens through Robert Hand and the Project Hindsight scholarship reclaimed by Chris Brennan, the page treats raw planetary data as the indispensable substrate of evidence-based astrology. The Hellenistic and modern western methods diverge on interpretation, but both depend on accurate sky positions; that is the role of these tables.