A 19th century instrument, still in use How does one measure the length of the day and intensity of

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A 19th century instrument, still in use How does one measure the length of the day and intensity of DMCA
A 19th century instrument, still in use How does one measure the length of the day and intensity of DMCA
A 19th century instrument, still in use How does one measure the length of the day and intensity of DMCA