30-MAY-1423 :- Birth OF Georg Von Peuerbach , inventor of Theoricae Novae Planetarum.

Georg von Peuerbach also Purbach, Peurbach, Purbachius
(born May 30, 1423 – April 8, 1461) was an Austrian astronomer,mathematician and instrument maker, best known for his streamlined presentation of Ptolemaic Astronomy in the Theoricae Novae Planetarum.

One of Peuerbach's best known works is his Theoricae Novae Planetarum. It began as a series of lectures transcribed by Regiomontanus. The Theoricae Novae was an attempt to present Ptolemaic astronomy in a more elementary and comprehensible way. The book was very successful, replacing the older Theoricae Planetarum Communis as the standard university text on astronomy and was studied by many later-influential astronomers including Nicolaus Copernicus and Johannes Kepler.

In 1457 Peuerbach observed an eclipse and noted that it had occurred 8 minutes earlier than had been predicted by the Alphonsine Tables, the best available eclipse tables at the time. He then computed his own set of eclipse tables, the Tabulae Eclipsium. Widely read in manuscript form beginning around 1459 and formally published in 1514, these tables remained highly influential for many years.

Peuerbach wrote various papers on practical mathematics, and constructed various astronomical instruments. Most notably, he computed sine tables based on techniques developed by Arabian mathematicians.

In 1460, Cardinal Johannes Bessarion, while visiting Frederick's court seeking assistance in a crusade to reclaim Constantinople from the Turks, proposed that Peuerbach and Regiomontanus create a new translation of Ptolemy's Almagest from the original Greek. Bessarion thought that a shorter and more clearly written version of the work would make a suitable teaching text. Peuerbach accepted the task and worked on it with Regiomontanus until his death in 1461, at which time 6 volumes had been completed. Regiomontanus completed the project, the final version containing 13 volumes.^[2]