Pope Pius IX Defines Immaculate Conception as Dogma (1854)
1965, Dec. 8: The Second Vatican Council is solemnly ended
i went to New Advent, and typed in December 8, and got this…
The Making of the Catholic Encyclopedia (1917)
Actual work on the Encyclopedia was begun in January, 1905. It was completed in April, 1914. For two years before the formation of a Board of Editors those who were to be its editors and publishers met together occasionally to confer about its publication. These meetings resulted in an agreement among the editors on December 8, 1904, to begin the work early the next year and in the choice of those who were to be its publishers.