February 15, 1564 (Julian calendar/old style: a Tuesday)

Galileo

On this date, the Florentine-Italian astronomer Galileo Galilei was born in Pisa, Italy. Galileo made a good discovery great. Upon hearing at age 40 that a Dutch optician had invented a glass that made distant objects appear larger, Galileo crafted his own telescope and turned it toward the sky. He quickly discovered that our Moon has craters, that Jupiter has its own moons, that the Sun has spots, and that Venus has phases like our Moon. Galileo, who lived to 1642, made many more discoveries. He claimed that his observations only made sense if all the planets revolved around the Sun, as championed by Aristarchus and Copernicus, and not around the Earth, as was commonly believed then. The powerful Roman Inquisition made Galileo publicly recant this conclusion, but today we know he was correct.

Advertisements

One response to “February 15, 1564 (Julian calendar/old style: a Tuesday)

  1. It’s astounding that Galileo also postulated the basic principle of relativity, which states that the laws of physics are same in any system moving at a constant velocity. It’s encapsulated mathematically in Newton’s second law, and is central to Einstein’s theory of general relativity.

Leave a Reply

Please log in using one of these methods to post your comment:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s