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How Did Henrietta Swan Leavitt Discover Cepheid Periodicity?

šŸ’” The Answer

  • She analyzed photographic plates of the Magellanic Clouds taken at Harvard College Observatory.
  • By measuring brightness changes over time, she noticed a clear pattern linking period to luminosity.
  • Her 1912 paper established the period-luminosity law, revolutionizing distance measurement.
  • Despite her groundbreaking work, she was not awarded a Nobel Prize.

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1873 — The Clay Street Hill Railroad begins operating the first cable car in San Franci

1873 — The Clay Street Hill Railroad begins operating the first cable car in San Franci

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