On this day in science history: 15 May

From the days of ancient technology to modern science - find out what happened on this day in the history of science.

15th May 2017
Bailey's Beads © Universal History Archive/UIG via Getty Images

© Universal History Archive/UIG via Getty Images

1836 - Bailey's Beads observed

Francis Bailey observes and explains why shortly before and after a total eclipse of the Sun light spots appear around the Moon: it is its uneven surface with many craters and mountains that lets more or less light through. The phenomenon is known as Bailey's beads.

1857 - Williamina Paton Stevens Fleming born

Williamina Paton Stevens Fleming © via Wikimedia Commons
© via Wikimedia Commons

Astronomer Williamina Paton Stevens Fleming saw the day of light on 15 May 1857. She reached for the stars and developed a classification based on their spectra, discovered white dwarfs and the Horsehead Nebula.

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