September 19, 2026 · 7 min
Why the planets seemed to wander
Five lights that did not keep pace with the stars, and the long effort to explain their loops.
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A short letter every Sunday: one discovery about the sky, and the steps that led to it.
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The first telescopes, and what they showed
Moons around Jupiter, phases of Venus and craters on the Moon, all in the first few years.
What the ancient sky watchers could see
Without any lens at all, people tracked the Sun, the Moon and the stars well enough to keep calendars.