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:
“The beginning of an acquaintance whether with persons or things is to get a definite outline of our ignorance.”
—George Eliot [Mary Ann (or Marian)
“The home is a woman’s natural background.... From the beginning I tried to have the policy of the store reflect as nearly as it was possible in the commercial world, those standards of comfort and grace which are apparent in a lovely home.”
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“The high plains, the beginning of the desert West, often act as a crucible for those who inhabit them. Like Jacob’s angel, the region requires that you wrestle with it before it bestows a blessing.”
—Kathleen Norris (b. 1947)