Heraclitus B3 · B3

Heraclitus is reported to have said the sun is only as wide as it looks — the breadth of a human foot. To a modern ear this sounds like a blunder, and Aristotle already treated it as one. But it follows from a principle Heraclitus holds elsewhere: the world we are given is the world of appearances, and the measure of a thing can be the measure it shows. The sun that rises new each day (B6) and never oversteps its bounds (B94) is a sun taken at face value, not a body inferred behind the phenomenon.

The unit is telling. A <em>pous</em>, a 'foot,' is at once a part of the body and a standard of measurement — the same doubling English keeps in its own 'foot.' To size the sun by a human foot is to make man, quite literally, the measure; the cosmos is reported in the units of the body that observes it. Whether Heraclitus meant the claim as physics or as a lesson about the reach of sight, it plants the sun firmly inside the human scale — close and daily, not the remote furnace of the astronomers.

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