APIAN, (PETER), in biography-, an eminent astronomer and mathematician, called in German 13iene-witz, was born at Loisnich, in Misnia, and became professor of mathematics at Ingolstaclt, in 1524. He wrote several treatises on astronomy and the matheinatics, and enriched these sciences with many instruments and ob semations. His first work was a "Trea tise on Cosmography, or Geographical Instructor ;" this was published in 1530, and in three years after he constructed at Nuremberg a curious instrument, which shewed the hour of the day, by means of the sun's rays, in all parts of the earth. In the year 1540, he published his princi pal work, entitled "Astronomicon Cmsa rxum," containing many interesting ob servations, with the descriptions and divi sions of instruments, calculations of eclip ses, and the construction of them in piano. In a second part of the work is a descrip tion of the construction and use of an astronomical quadrant, to whicb is annex ed observations on five different comets: in these he shews that the tails of comets are always projected in a direction oppo site to the sun. Our limits do,_ not.Olow
us to enumerate all the treatises of Apian : they were as marectable as nymerous, and the author was treated with the kind est attention I% the emperor Charlesy., who publiihed several of his works at his own expense, conferred upon him the honour of nobility, and presented him with 3000 crowns. Apian died at lngolstadt in 15..i2, leaving behind him a high repu tation for learning, and a son Philip, ho was also an eminent astronomer, and taught the sciences both at Tiibi 'igen and Ingolstadt. Philip (lied in 1589, and left a treatise on " Solar-dials." He gave an account of the new star that appeared in Cassiopeia in 1572, which is preserved.