Giulio Cesare la Galla

Giulio Cesare la Galla (1576 – 1624) was a professor of philosophy at the Collegio Romano in Italy. (His name is also given as Julius Cæsar Lagalla or Giulio Cesare Lagalla.)

He was born in Padua, at that time part of the Republic of Venice. Lagalla was educated in philosophy and medicine. He became the official physician of the papal galleys for a period, then came to Rome to lecture in natural philosophy at the Collegio Romano. He apparently became the leading peripatetic of the city, and was counted among the opponents of the Copernican heliocentric theory.

Following Galileo’s observations of the Moon by means of a telescope, published in "Sidereus Nuncius", Lagalla published a booklet in response. He participated in the demonstrations of the instrument by Galileo and was not among those who doubted the ability of the instrument. But he did debate Galileo's three-dimensional representation of the Moon based on two-dimensional visual observations.

In his book "De Phenomenis in Orbe Lunae" (published in Venice in 1612) he claimed that the untreated stone (known as "lapis solaris" and shown to him by Galileo Galilei) was unable to give off light only after calcination. We now know that the "Bolognian Stone" was a piece of barite (barium sulphate).

In 1935, the IAU voted to name Lagalla crater on the Moon after him.

Bibliography

*"De luce et lumine altera disputatio"
*"De phaenomenis in orbe lunae novi telescopii usu nunc iterum suscitatis" (1612)
*"De Immortalitate animorum ex Aristot. sententia" (1621)

External links

* [http://www.isbc.unibo.it/Files/10_SE_BoStone.htm The Discovery of Luminescence: "The Bolognian Stone"]