Marinus was originally from Tyre in the Roman province of Syria. He and his work were a precursor to that of the great geographer Claudius Ptolemy, who used Marinus's work as a source for his Geography and acknowledges his great obligations to him. Ptolemy said, "Marinus says of the merchant class generally that they are only intent on their business, and have little interest in exploration, and that often through their love of boasting they magnify distances." Later, Marinus was also cited by the Arab geographeral-Masʿūdī. Beyond this, little is known of his life.
Legacy
Marinus's geographical treatise is lost and known only from Ptolemy's remarks. He introduced improvements to the construction of maps and developed a system of nautical charts. His chief legacy is that he first assigned to each place a proper latitude and longitude. His zero meridian ran through the westernmost land known to him, the Isles of the Blessed around the location of the Canary or Cape Verde Islands. He used the parallel of Rhodes for measurements of latitude. Ptolemy mentions several revisions of Marinus's geographical work, which is often dated to 114 although this is uncertain. Marinus estimated a length of 180,000 stadia for the equator, roughly corresponding to a circumference of the Earth of 33,300 km, about 17% less than the actual value. He also carefully studied the works of his predecessors and the diaries of travelers. His maps were the first in the Roman Empire to showChina. He also invented equirectangular projection, which is still used in map creation today. A few of Marinus's opinions are reported by Ptolemy. Marinus was of the opinion that the World Ocean was separated into an eastern and a western part by the continents of Europe, Asia and Africa. He thought that the inhabited world stretched in latitude from Thule to Agisymba and in longitude from the Isles of the Blessed to Shera. Marinus also coined the term Antarctic, referring to the opposite of the Arctic Circle. In 1935, a lunar impact crater was named after Marinus.
