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William H. Pickering

astronomy
Henrietta Swan Leavitt and the Light of the Cepheids

Henrietta Swan Leavitt and the Light of the Cepheids

Harald Sack
On July 4, 1868, American astronomer Henrietta Swan Leavitt was born. She is best known for her discovery of the relation between the luminosity and the period of Cepheid variable stars. Based on her luminosity-period relation for Cepheids, Edwin Hubble was able to determine that the universe is expanding. Henrietta Swan Leavitt – Early Years Henrietta Swan Leavitt was born in Lancaster, Massachusetts, as daughter among seven children of Congregational church minister…
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astronomy
Percival Lowell and the Search for Pluto

Percival Lowell and the Search for Pluto

Harald Sack
On March 19, 1915, American astronomer Percival Lowell began to make photographies of the sky in the Lowell Observatory, which was founded by him, to search for a planet beyond Neptune. 15 years later, the dwarf planet Pluto was discovered on these photographies. “Formulae are the anaesthetics of thought, not its stimulants and to make any one think is far better worth while than cramming him with ill-considered, and therefore indigestible, learning.” –…
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