A Solemnity of the Roman Catholic Church observes an event in the life of Jesus, Mary, and the saints, beginning on the evening prior to actual date. Solemnity is made up of Latin words solet and annus, meaning a yearly (annual) celebration. They are observed throughout the entire Church.

Solemnities observed by the Roman Church
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
January 1 Mary, Mother of God
Sunday between Jan 2 & 8 Epiphany
March 19 Joseph, Husband of Mary
March 25 Annunciation
March/April (varies) Easter Triduum
40 days after Easter Ascension of the Lord
50 days after Easter Pentecost
Sunday after Pentecost Holy Trinity
Sunday after Holy Trinity Body and Blood of Christ (Corpus Christi)
Friday after Body & Blood Sacred Heart
June 24 Birth of John the Baptist
June 29 Peter and Paul, Apostles
August 15 Assumption of Mary
November 1 All Saints
November (varies, always Sun) Christ the King
December 8 Immaculate Conception
December 25 Christmas

See also