What is interesting about Mardi Gras is that many people do not
          realize how deeply rooted it is in Catholic tradition.  New
          Orleans is a Catholic city.  The day of Mardi Gras is determined
          by what day Easter falls on during that particular year.  Easter
          Sunday falls on the first Sunday after a full moon after the Spring
          Equinox.
      
      
        The Spring Equinox is when the day and the night are of equal length,
          whereas a Solstice is when the day is either the longest or the
          shortest of the year.  
      
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| 1866 Comus Parade | 
          From Ash Wednesday until Easter, Catholics observe Lent. 
              Mardi Gras has been described to me in the past as the "last
              hurrah" before a time of prayer and restraint and a time of
              spiritual preparation for Easter.  
        
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| Sketch of 1912 Parade Float |