Blink Comparator

Blink Comparator

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Description

Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. A blink comparator was a viewing apparatus used by astronomers to find differences between two photographs of the night sky shot using optical telescopes such as astrographs. It permitted rapidly switching from viewing one photograph to viewing the other, "blinking" back and forth between the two taken of the same area of the sky at different times. This allowed the user to more easily spot objects in the night sky that changed position. It was also sometimes known as a blink microscope. In photographs taken a few days apart, rapidly moving objects such as asteroids and comets would stand out, because they would appear to be jumping back and forth between two positions, while all the other fixed stars stood still. Photographs taken at longer intervals could be used to detect stars with large proper motion, or variable stars, or to distinguish binary stars from optical doubles. The most notable body to be found using this technique was Pluto, discovered by Clyde Tombaugh in 1930.show more

Product details

  • Paperback | 68 pages
  • 152 x 229 x 4mm | 113g
  • Tort
  • United States
  • English
  • black & white illustrations
  • 6135649248
  • 9786135649246