1598 Magini Map of Sumatra/ Sri Lanka according to Ptolemy

Giovanni Antonio Magini (June 13, 1555 - February 11, 1617) was an Italian astronomer, astrologer, cartographer, and mathematician. Born in Padua, he completed his studies in philosophy in Bologna in 1579. In 1588 he was chosen over Galileo Galilei as the chair of mathematics at the University of Bologna after the death of Egnatio Danti. Magini was a prolific writer, putting forth theories of celestial motion (he was a supporter of a geocentric solar system), the use of quadrants in surveying and astronomy, and trigonometry. In 1608, Magini produced the first map of Italy to improve on that of Gastaldi: his meticulously researched and beautifully engraved 8-sheet Italia Nuova was hugely influential: upon its publication, Blaeu promptly copied it to produce his own wall map of Italy; the rest of the mapmaking establishment swiftly followed suit. Consequently, virtually every 17th century map of Italy can be identified as a derivative of Magini's monumental achievement. His atlas, Atlante geografico d’Italia, was published posthumously by his son in 1620. This work was intended to include maps of every Italian region with exact nomenclature and historical notes. He also served as court astrologer for the Duke of Mantua. Learn More...

Claudius Ptolemy (83 - 161 AD) is considered to be the father of cartography. A native of Alexandria living at the height of the Roman Empire, Ptolemy was renowned as a student of Astronomy and Geography. His work as an astronomer, as published in his Almagest, held considerable influence over western thought until Isaac Newton. His cartographic influence remains to this day. Ptolemy was the first to introduce projection techniques and to publish an atlas, the Geographiae. Ptolemy based his atlas on the "Geographiae" of Strabo, the cartographic materials assembled by Marinus of Tyre, and contemporary accounts provided by the many traders and navigators passing through Alexandria. Ptolemy's Geographiae was a ground breaking achievement far in advance of any known pre-existent cartography, however, it was not without flaws. In a masterstroke of ego that would last over 1,500 years, Ptolemy filled the many unknown and unexplored lands with mountains, lakes, and rivers that he merely assumed must exist. His other great error involved his use of the Cape Verde Islands as a Prime Meridian, thus wildly over estimating distances east of this point, and conversely underestimating the distances west. The ultimate result of this error was Columbus's fateful expedition to India in 1492. In any case, though the text of Ptolemy's Geographiae did survive, the maps that supposedly accompanied it did not. The earliest known Ptolemaic maps are in manuscript format and date to approximately 1300. Most of Ptolemaic maps that have come down to us today are based upon the manuscript editions produced in the mid 15th century by Donnus Nicolaus Germanus, who provided the basis for both the 1477 Bologna and the 1482-6 Ulm Ptolemies. Even after printed versions became broadly available, later authorities - Waldseemuller in 1513, Mercator in 1578 - would consult early manuscript Ptolemies in revising new editions of the work. Learn More...