Galileo's telescopes: Facing the facts
Few events in history have proved as momentous as Galileo's discovery of the moons of Jupiter. David Wootton explains why.
Four hundred years ago Galileo Galilei (1564-1642) was in a state of anxiety. In January he had discovered four moons orbiting Jupiter. In March he had published this and other remarkable discoveries made with his improved telescope in Sidereus Nuncius (‘The Starry Messenger’). But by the summer he was becoming profoundly alarmed. He had offered philosophers and mathematicians in Venice, Padua, Florence, Pisa and Bologna the chance to look through his telescope and confirm his discoveries. Some, including Cremonini, the highest paid academic in Italy and a good friend of Galileo’s, had simply refused. Others had looked, but had said they could not see what on earth he was talking about. Only Kepler in Germany had come out in his support, but he had yet to get hold of a decent telescope so had not seen the moons for himself. He was prepared to believe Galileo because he – and hardly anyone else – shared Galileo’s Copernicanism.
This article is available to History Today online subscribers only. If you are a subscriber, please log in.
Please choose one of these options to access this article:
- Purchase an online subscription
- Purchase a print and online subscription
- If you are already a print subscriber, purchase the online archive upgrade
Call our Subscriptions department on +44 (0)20 3219 7813 for more information.
If you are logged in but still cannot access the article, please contact us
- Middle East
- North America
- South America
- Central America
- Early Modern
- 20th Century
- 21st Century
- Economic History
- Environmental History
- Historical Memory
- Science & Technology