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175th anniversary: Pope Pius IX promulgated the apostolic constitution Ineffabilis Deus,...

Sat, December 8, 2029

in 3 yr

Source

In 1854, Pope Pius IX promulgated the apostolic constitution Ineffabilis Deus, proclaiming the dogmatic definition of the Immaculate Conception, which holds that the Virgin Mary was conceived free of original sin.

Also on Dec 8, 2029

Source, method and history
Source
Wikipedia
How we know
Wikipedia "On this day" selected anniversary, 175 years (1854 to 2029).
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annual
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Changes
  • 2026-09-25: added to 2029-12-08