Milestones: Thursday, November 30, 2023
REVOLUTIONARY DISCOVERY — THE ITALIAN ASTRONOMER AND PHYSICIST Galileo Galilei utilized his newly-built telescope to observe the moon for the first time on Nov. 30, 1609. Improving on the telescope’s original design by Dutch eyeglass makers, Galileo had ground and polished his own lenses to a sensitivity that gave greater magnification. The telescope helped him discover that the moon’s surface was not smooth but, instead, rich in topography with mountains and valleys. While other astronomers had also used a telescope to observe the moon, Galileo was the first to publish a detailed report, titled “Sidereus Nuncius” (Starry Messenger). The 1610 report, which brought him fame, provided detailed sketches of the moon’s surface, thus challenging the popular ideas of the day.
Galileo ran afoul of church authorities during a time of the 16th-17th century Roman Inquisition, which severely punished people with views divergent from Catholic doctrine. While the Church accepted the news of the moon’s terrain, it rejected the idea that the earth orbited the sun (heliocentrism), which was considered heretical at the time, and placed him on trial.
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