They discover a lost astronomical treatise by Ptolemy that was hidden under a medieval manuscript

It is the oldest known text dedicated to the description of a scientific instrument.

Color image of Lumière Technology with the Latin overtext reversed in brown and faint traces of the Greek subtext Venerable Ambrosian Library

A treatise by the astronomer Claudio Ptolemy that was believed to be lost has been discovered under the ‘Etymologies’ of Isidore of Seville copied in the 8th century in a palimpsest that is kept in the Veneranda Biblioteca Ambrosiana in Milan (Italy). It’s about a …

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