🗺️ A History of Maps

What you’ll learn

1. The Map Is Not the TerritoryUnderstand the course's central claim: a map is a selective argument about the world, not a neutral picture of it.Every map is built from choices about what to include, emphasize, and omit. A perfectly complete map would be a useless full-size copy; usefulness comes from editing. Maps can even create what they claim to describe, as when Waldseemüller's 1507 map named America.
2. Every Map Points SomewhereSee that a map's orientation and centre are arguments, using T-O, al-Idrisi, and modern maps.North-up is a convention, not a fact — 'orient' comes from the east. Medieval T-O maps put east up and Jerusalem central; al-Idrisi drew south up with Arabia central. Each choice states what its maker thought mattered; the 'objective' modern map hides its own viewpoint.
3. The Edges of the KnownInterpret how mapmakers handled the unknown — monsters, rumor, and the myth of 'here be dragons.'The edge of the map was where knowledge stopped. Olaus Magnus's 1539 Carta Marina used sea monsters to encode real warnings about dangerous waters. The famous phrase 'here be dragons' is, as an actual map inscription, essentially unique to the c.1510 Hunt–Lenox Globe.
4. You Cannot Flatten a Sphere Without LyingGrasp why flattening a sphere forces distortion, and what bargain the Mercator projection makes.A sphere cannot be flattened without stretching, tearing, or squashing — no projection preserves shape, area, distance, and direction at once. Mercator (1569) preserves compass direction for navigation but inflates area toward the poles; Africa is about 14× Greenland's ~2.2 million km² area of ~30.4 million km².
5. Projection Is PoliticsUnderstand the Peters controversy and the claim that projection is politics.The equal-area Gall–Peters projection shows every region at true relative size but distorts shape. Arno Peters argued Mercator marginalized the global South; cartographers replied that no projection is 'true.' Both are right: flattening forces a trade-off, so choosing what to preserve is choosing what matters.
6. Knowing Where You AreSee how mapmakers actually fix positions — latitude, the longitude problem, and triangulation.Latitude is readable from the sky; longitude requires precise timekeeping and was long unsolved, leaving the world map blurry east–west (the chronometer story belongs to Navigation at Sea). Triangulation — one measured baseline plus angles — let national surveys fix whole countries and turned mapmaking into measurement.
7. The Map as an Instrument of PowerRecognize maps as instruments of state power — taxation, war, and colonial borders.National surveys were paid for by states for taxing, conscription, and war (Britain's 'Ordnance' Survey began as military mapping). Cadastral, census, and colonial maps impose grids that become enforced reality. Africa's straight-ruled colonial borders, largely drawn in Europe, still shape modern states and conflicts.
8. The Map That Knows Where You AreUnderstand how GPS and digital maps inverted the map — and why they remain arguments.GPS turns the surveyor's triangulation into orbit: timed satellite signals fix a receiver's position, solving the ancient 'where am I?' problem automatically. Yet digital maps still choose a projection (usually Web Mercator), composite imagery, labeling, and disputed borders — so even the satellite map is still someone's claim about the world.

Questions this course answers

Grounded in trusted sources

• J. B. Harley, 'The New Nature of Maps: Essays in the History of Cartography'
• Mark Monmonier, 'How to Lie with Maps' and 'Rhumb Lines and Map Wars'
• John P. Snyder, 'Flattening the Earth: Two Thousand Years of Map Projections'
• J. B. Harley & David Woodward (eds.), 'The History of Cartography'
• Chet Van Duzer, 'Sea Monsters on Medieval and Renaissance Maps'
• Jerry Brotton, 'A History of the World in Twelve Maps'
• James C. Scott, 'Seeing Like a State'
• Dava Sobel, 'Longitude'

Every Wunder lesson is built from real, reputable sources — never invented.

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