The Piri Reis Map Steven Dutch University of Wisconsin-Green Bay.

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Presentation transcript:

The Piri Reis Map Steven Dutch University of Wisconsin-Green Bay

The Piri Reis Map

A Portolan Chart

The Portolan Grid Equator and 45N are quite accurate Map ends just below 45S Intermediate Roses Might Represent Tropics (23.5 N or S) or 1/8 of a Hemisphere (22.5 N or S)

The Portolan Grid Radiating Lines are Compass Bearings Meridians and Parallels are perpendicular This is a Cylindrical Map Projection

Quality of Cartography Europe and Africa – Coasts Pretty Good – Rivers Inaccurate Brazil: Recognizable North America and South of Brazil: Very Poor

Interpreting Ancient Maps Any Ancient Map is Only as Good as Its Depiction of Well Explored Areas Things of Practical Use to Mariners (Capes and Islands) Often Exaggerated Latitude is the Most Likely Parameter to be Accurate; Longitude Largely Guesswork Imaginary Features Often Incorporated and Gaps Filled In

Corsica by Piri Reis

The Orontius Finaeus Map, 1531

Antarctica?

Map by Mercator, 1587

Hendrik Hondius Map, 1630

A Vicious Circle Without Accurate Navigation, Accurate Maps Weren’t Necessary – Maps Were Largely Schematic Without Accurate Maps, there was no Point in Trying to Navigate Precisely Coastal Charts, on the Other Hand, Were Valuable Even Into Modern Times, Many Questioned the Need for Accurate Mapping

What’s Missing? The Pacific Ocean Isthmus of Panama Drake Passage – Deep Water: Was Never Dry Land – No Evidence of Antarctic Ice Connection Any Indisputable Feature of Antarctica

Arm-Waving Looks Persuasive Azimuthal Equidistant Projection Centered on Cairo

Detailed Comparison Doesn’t

Azimuthal Equidistant Projection Centered on 0,0

Orthographic Projection

Cylindrical Equidistant Projection

Likely Identification

Alternative Identification

Not Antarctica

Conclusions All Identifications of Antarctica Fail By Modern Standards, Not a Very Accurate Map Has Exactly the Inaccuracies Expected for a 1513 Map For 1513, A First-Rate Work of Naval Intelligence – Turkey Was Not Involved in Atlantic Exploration – Synthesis of Captured Documents – Remarkable Level of Detail for 1513