Carl Sagan — "The notion that the pre-Copernican Earth was flat is a common misconception."
The notion that the pre-Copernican Earth was flat is a common misconception.
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Understanding this quote
What it means
The quote corrects a widespread historical error: people before Copernicus did not generally believe Earth was flat. Ancient Greek scholars, including Eratosthenes, had calculated Earth's circumference centuries earlier. Medieval educated society accepted its spherical shape. The 'flat Earth Middle Ages' story is itself a fabrication, likely invented in the 19th century to portray religious thinkers as ignorant. Sagan insists that history must be understood accurately, not distorted to serve convenient cultural narratives.
Relevance to Carl Sagan
Sagan dedicated his career to dismantling myths and correcting scientific misinformation. His landmark series Cosmos (1980) and The Demon-Haunted World (1995) both emphasized critical thinking and historical accuracy. He understood that misrepresenting how past civilizations viewed nature distorts public perception of science itself. Defending genuine astronomical history was deeply personal; he revered Eratosthenes' achievement and refused to let it be erased by a convenient story casting all pre-modern people as ignorant.
The era
During Sagan's lifetime, a narrative of inevitable conflict between science and religion portrayed the medieval church as enforcing flat-Earth ignorance. This framing dominated popular textbooks through the 1960s–80s. Historians like Jeffrey Burton Russell were actively debunking the myth in the late 1980s–90s. Simultaneously, the space age reshaped how the public understood Earth's place in the cosmos, making historical accuracy about humanity's prior conceptions of Earth's shape especially culturally resonant.
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