Beginning
Based only on uncertain descriptions of the first practical telescope, invented by Hans Lippershey in the Netherlands in 1608, Galileo, in the following year, made a telescope with about 3x magnification. He later made improved versions with up to about 30x magnification. With a Galilean telescope the observer could see magnified, upright images on the earth—it was what is commonly known as a terrestrial telescope or a spyglass. He could also use it to observe the sky; for a time he was one of those who could construct telescopes good enough for that purpose. On 25 August 1609, he demonstrated one of his early telescopes, with a magnification of about 8 or 9, to Venetian lawmakers. His telescopes were also a profitable sideline for Galileo selling them to merchants who found them useful both at sea and as items of trade. He published his initial telescopic astronomical observations in March 1610 in a brief treatise entitled Sidereus Nuncius (Starry Messenger).
Read more about this topic: Visible-light Astronomy
Famous quotes containing the word beginning:
“But from the beginning of creation, ‘God made them male and female.’ ‘For this reason a man shall leave his father and mother and be joined to his wife, and the two shall become one flesh.’ So they are no longer two, but one flesh. Therefore what God has joined together, let no one separate.”
—Bible: New Testament, Mark 10:6-9. . . .
“You know that the beginning is the most important part of any work, especially in the case of a young and tender thing; for that is the time at which the character is being framed.”
—Plato (5th century B.C.)
“I couldn’t find the spot where Frank had hidden the bag with the clothes. You can’t imagine how cold I was until I found them. You know, I’m beginning to understand why ghosts moan so in this sort of weather.”
—Lester Cole (1904–1985)