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The astronomical unit (AU) is the distance from the Earth to the Sun. Four hundred years ago, the German mathematician Johannes Kepler discovered that the time a planet takes to go around the Sun depends on how far away it is. Facts Concerning the Solar System • All the planets roughly orbit the Sun in a plane. • This plane is roughly the same as the rotational equator of the Sun. • Planetary orbits are, for the most part, circular. • The planets all revolve in the same direction about the Sun. Fact Sheet. Astronomy Day is a grass roots movement designed to share the joy of astronomy with the general population - "Bringing Astronomy to the People." On Astronomy Day, thousands of people who have never looked through a telescope will have an opportunity to see first-hand what has so many amateur and professional astronomers all excited. Following the Thabit ibn Qurrah’s line of study, another Muslim astronomer al-Battani (Albategnius) made some of most important contributions in Islamic astronomy. “He discovered the increase of the sun’s apogee since time of Ptolemy which led to the discovery of the solar apsides. Jan 30, 2014 · Facts about Ptolemy. January 30, 2014, cherran, Leave a comment. Claudius Ptolemy was a Greek-Roman polymath, born in first century AD (90 AD-168AD) in Egypt. He had command over fields of astronomy, mathematics and geography. Little is known about his personal life, except the fact that he never married, and died in Alexandria (Egypt). This Pin was discovered by Werner Klokow. Discover (and save!) your own Pins on Pinterest.