 The full title of Rivas's 11-folio booklet is translated in English as "Syzygies and Lunar Quadratures Aligned to the Meridian of Mérida of the Yucatán by an Anctitone or Inhabitant of the Moon, and Addressed to the Scholar Don Ambrosio de Echevarria, Reciter of Funeral Kyries in the Parish of Jesus of Said City, and Presently Teacher of Logarithm in the Town of Mama of the Yucatán Peninsula, in the Year of the Lord 1775".No actual date of composition is given in the manuscript.The manuscript was rediscovered in 1958 by Pablo González Casanova, "hidden among the dusty volumes of the National Archives in Mexico City"—in fact, among the documents compiled by the Inquisition pertaining to Rivas's trial.