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@Z. Dailey asks a mathematical puzzle Important days in history... and to come! with a series of dates in years 1973, 1978, 1983, 1992, 2005.

My puzzle asks the question: What is the previous date in my series? Explain!!

.......... .., .....
      June 22, 1973  
.......... .., .....
      June 16, 1978
      June 11, 1983
     March 25, 1992
     April 14, 2005

Hint:

"rudder as a male swan"

Improve this question
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  • $\begingroup$ A male swan being a rot13(pbo) $\endgroup$
    – Khale_Kitha
    Mar 24, 2016 at 20:42
  • 2
    $\begingroup$ Apparently ebhtu nf n pbo is a phrase $\endgroup$
    – question_asker
    Mar 24, 2016 at 21:49
  • $\begingroup$ Logic dictates there's a high chance that the year is 1969, the fake moon landing year. $\endgroup$
    – Overmind
    Sep 7, 2016 at 11:07
  • 11
    $\begingroup$ @Overmind I would question your failed conclusion. $\endgroup$
    – garr890354839
    Nov 29, 2016 at 14:31
  • $\begingroup$ Nothing failed about it. Also it's valid from a math p.o.v. ;check the MM/DD also. $\endgroup$
    – Overmind
    Dec 9, 2016 at 6:54

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