In remote ancient China, people began to study the workings of the heavenly bodies at an early age, which gave birth to the art of qintianji and stargazing. Most of the famous talents in ancient China also knew the art of stargazing, and even the ancient emperors would combine the celestial signs with the fate of the country.
With the development of time, until the 17th century, although people had made many astronomical observing instruments, such as the Hun Yi and Jane Yi in China, the observation work still relied only on the human naked eye. In modern times, mankind waved goodbye to the era of naked-eye observation of the sky, because an epoch-making invention appeared, that is - astronomical telescope. Since then, mankind has a "clairvoyant" insight into the depths of the universe, and the development of astronomy has stepped into a new level.
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This epoch-making astronomical invention, belongs to a great scientist - Galileo.
In 1609, in Amsterdam, the capital of the Netherlands, there was an eyeglass merchant named Hans Ripahi, one day had to go out, his young apprentice in order to find fun, to kill time, to take two lenses to look at the distant church roof wind mark, the wind mark became large and close, the young apprentice told the eyeglass merchant of this discovery. Spectacle merchant to modify, so the world's first telescope was born in his hands.
Galileo after listening to this story, serious thinking, immediately hands-on manufacturing of their own telescope. He found a 2.4cm caliber lead tube, a convex lens and a concave lens into which to do their own first telescope. He followed it with a second and a third ...... telescope until he had a telescope with a magnification of 20 times.
The new telescope was built, Galileo was the first telescope to the sky, his first target celestial body is the moon, he will be the new discovery of the moon named "craters", "moon sea" ... ... these names have been followed. ... these names have been used to this day.
Galileo pioneered the first human observation of celestial bodies with a telescope, his great achievements in the history of astronomy and its glorious chapter, so 1609 also became the starting point of modern astronomy.