Jupit

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What I have been reading, checking and getting excited about: Jupiter, its moons, the spacecraft on their way there, and now and then something much further off.

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No light-age here: this is ink, printed in 1610.
Explainer,

I replayed Galileo's first week at Jupiter

In January 1610 Galileo drew little stars shifting beside Jupiter night after night. I set my clock to each evening and checked his drawings against the sums.