The Sand Reckoner - Wikipedia, the free encyclopedia

Blogged on: April 7, 2007, 12:23 pm
Work by Archimedes in which he sets out to determine an upper bound for the number of grains of sand that fit into the universe. In order to do this, he has to estimate the size of the universe according to the then-current model, and invent a way to talk
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astronomy | history | ancient | mathematics

Visions of Ancient Night Sky Were Hiding in Plain Sight for Centuries

Blogged on: January 25, 2005, 5:08 pm
No one has seen the catalog for centuries, a fabled ancient text apparently lost forever.
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stars | astronomy | history | ancient

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ancient astronomy history

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