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Text File  |  1992-09-02  |  294b  |  9 lines
  1. Algol, or Beta Persei
  2. An eclipsing binary, a pair of rotating stars
  3. in the constellation Perseus, one of which
  4. eclipses the other every 69 hours, causing
  5. its brightness to drop by two thirds. The
  6. brightness changes were first explained in
  7. 1782 by amateur astronomer John Goodricke
  8. (1764-1786).
  9.