Rudolphine Tables and instructive examples for computing planetary positions. For most stars these tables were accurate to within one arc minute, and included corrective factors for atmospheric refraction. The tables were sufficiently accurate to predict a transit of Mercury observed by Pierre Gassendi in 1631 and a transit of Venus observed by Jeremiah Horrox in 1639. Rudolphine Tables The Rudolphine Tables () consist of a star catalogue and planetary tables published by Johannes Kepler in 1627, using some observational data collected by Tycho Brahe (1546–1601). The tables are named as "Rudolphine" in memory of Rudolf II, Holy Roman Emperor. Star tables had
Planetary Science Archive Planetary Science Archive The Planetary Science Archive is the central repository for all scientific and engineering data returned by the European Space Agency's Solar system missions: currently Giotto, Huygens, Mars Express, Rosetta, SMART-1, and Venus Express, as well as several ground-based cometary observations. It uses NASA's Planetary Data System standards as a baseline for the formatting and structure of all data contained within the archive. All of the data sets are peer reviewed and undergo an additional internal validation procedure. All data on the PSA are free to download and use.The Principal Investigator(s) as well as the ESA Planetary Science