Galileo Galilei to the biography by Vincenzo Viviani) that these began by watching the swings of the bronze chandelier in the cathedral of Pisa, using his pulse as a timer. Later experiments are described in his "Two New Sciences". Galileo claimed that a simple pendulum is isochronous, i.e. that its swings always take the same amount of time, independently of the amplitude. In fact, this is only approximately true, as was discovered by Christiaan Huygens. Galileo also found that the square of the period varies directly with the length of the pendulum. Galileo's son, Vincenzo, sketched a clock based on his father's
Galileo Galilei mondo) in 1632. Despite taking care to adhere to the Inquisition's 1616 instructions, the claims in the book favouring Copernican theory and a non Geocentric model of the solar system led to Galileo being tried and banned on publication. Despite the publication ban, Galileo published his "Discourses and Mathematical Demonstrations Relating to Two New Sciences" ("Discorsi e Dimostrazioni Matematiche, intorno a due nuove scienze") in 1638 in Holland, outside the jurisdiction of the Inquisition. Galileo's main written works are as follows: Footnotes Citations Biography Galileo and the Church Galileo Galilei Galileo Galilei (; 15 February 1564 – 8 January 1642)