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 The following events occurred in April 1960:
 
  
  
  This article incorporates text from this source, which is in the  public domain .Grimwood, James M. "PART II (B) Research and Development Phase of Project Mercury January 1960 through May 5, 1961". Project Mercury - A Chronology. NASA Special Publication-4001. NASA . Retrieved 7 February 2023.
 This article incorporates text from this source, which is in the  public domain .Grimwood, James M. "PART II (B) Research and Development Phase of Project Mercury January 1960 through May 5, 1961". Project Mercury - A Chronology. NASA Special Publication-4001. NASA . Retrieved 7 February 2023. This article incorporates text from this source, which is in the  public domain .Brooks, Courtney G.; Ertel, Ivan D.; Newkirk, Roland W. "PART I: Early Space Station Activities -1923 to December 1962.". SKYLAB: A CHRONOLOGY. NASA Special Publication-4011. NASA. p. 11. Retrieved 5 March 2023.
 This article incorporates text from this source, which is in the  public domain .Brooks, Courtney G.; Ertel, Ivan D.; Newkirk, Roland W. "PART I: Early Space Station Activities -1923 to December 1962.". SKYLAB: A CHRONOLOGY. NASA Special Publication-4011. NASA. p. 11. Retrieved 5 March 2023.