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Home > 1676 in Science: R Mer's Determination of the Speed of Light(English)
1676 in Science: R Mer's Determination of the Speed of Light(English)

1676 in Science: R Mer's Determination of the Speed of Light(English)

          
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About the Book

Chapters: R mer's Determination of the Speed of Light. Source: Wikipedia. Pages: 24. Not illustrated. Free updates online. Purchase includes a free trial membership in the publisher's book club where you can select from more than a million books without charge. Excerpt: R mer's determination of the speed of light was the demonstration in 1676 that light has a finite speed, and so doesn't travel instantaneously. The discovery is usually attributed to Danish astronomer Ole R mer (16441710), who was working at the Royal Observatory in Paris at the time. R mer estimated that light would take about 22 minutes to travel a distance equal to the diameter of Earth's orbit around the Sun: this is equivalent to about 220,000 kilometres per second in modern units, about 26% lower than the true value. While the exact details of R mer's calculations have been lost, the error is probably due to an error in the orbital elements of Jupiter, leading R mer to believe that Jupiter was closer to the Sun than is actually the case. R mer's theory was controversial at the time he announced it, and he never convinced the director of the Royal Observatory, Giovanni Domenico Cassini, to fully accept it. However, it quickly gained support among other natural philosophers of the period, such as Christiaan Huygens and Isaac Newton. It was finally confirmed nearly two decades after R mer's death, with the explanation in 1729 of stellar aberration by the British astronomer James Bradley. The determination of longitude was a significant practical problem in cartography and navigation. Philip III of Spain had offered a prize for a method to determine the longitude of a ship out of sight of land, and Galileo proposed a method of establishing the time of day, and thus longitude, based on the times of the eclipses of the moons of Jupiter, in essence using the Jovian system as a cosmic clock; this method was not significantly improved until accurate mechanical...More: http: //booksllc.net/?id=2489690


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Product Details
  • ISBN-13: 9781156934111
  • Publisher: Books LLC
  • Publisher Imprint: Books LLC
  • Height: 152 mm
  • No of Pages: 26
  • Series Title: English
  • Sub Title: R Mer's Determination of the Speed of Light
  • Width: 229 mm
  • ISBN-10: 1156934117
  • Publisher Date: 15 Sep 2010
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Spine Width: 2 mm
  • Weight: 54 gr


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