Telescope

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Dinesh ^club

Johannes Hevelius with one of his telescopes (from Selenographia, 1647, an elaborate map of the moon). Hevelius, who lived in Danzig, Poland, built one enormous telescope 150 feet long. he also published an important star atlas. (No drawing or engraving records Galielo's telescopes, and the two of his manufacture which survive are not as powerful as the one he was using in 1610/11. Thus we do not know wha this own astronomical telescope looked lime)

3 years ago.

Dinesh ^club

Once both convex and concave lenses were commonly available, it was only a matter of time before an optical device like the telescope would be invented. Already by Aristotle’s time in the fourth century BCE it was known that a tube could help one view distant objects. In his book ‘On the Generation of Animals,,’ Aristotle explained that “the man who shades his eye with his hand or looks through tube will not distinguish any more of any less the difference in colors, but he will see further.” In the sixteenth century, the Danish astronomer Tycho Brahe observed the heavens using a long tube; even without lenses, this device enabled Brahe to make the impressive accurate observations of Mars’s orbit that enabled Kepler to discover that the planetary orbits are elliptical, not circular. ~ Page 58

19 months ago. Edited 19 months ago.

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