origins of nautical almanac

1766 John Harrison, first nautical almanac

lunar distance

history of longitude.

1730-1761 marine chronometer invented by John Harrison

Making of H4

Wooden regulator longcase , most accurate clock for 150 years

Timeline

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劣質洗衣機入水喉

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ES8311 and ES8388 codec IC

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sharpstar 150mm f/2.8 hyperbolic astrograph

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Hello!! It's Joseph

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