I was reading Wikipedia with two browser tabs open. One page was on bretwalda; the other page was on spherical harmonics. I have no idea how I ended up researching both simultaneously.

Things I learnt. Bretwalda. Wynn, yogh, eth, thorn, ash. Spherical harmonics. Fourier analysis (transformation and synthesis). Deferent and epicycle. How to make compound words from machine,┬ámechanic,┬ámachinist. Must watch “Ancient Astronomy” from The Great Courses (the library has a subscription). Must find more ways of describing an artisan.

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