#1 Why Extraordinary?
Jubilee Year or the Year of Lord's Favour is a phenomenon that comes from as early as the book of Leviticus. It was every 50th year as 7 sets of 7 years (49 years) came to a close.
However the Catholic Church began this tradition of celebrating the jubilee years from 1300 onwards. Though it began with once in 50 years very soon it became a year of celebration every 25 years!
That is how we have the 25th Jubilee year proclaimed in 2000! Ordinarily the next Jubilee should have been in 2025. But since the Holy Father did not want to lose the significance of the 08.12.2015, he has announced an "EXTRAORDINARY" year of jubilee, dubbing it Jubilee Year of Mercy!
What is special about Dec 8, 2015: It was the 50th anniversary of the Closure of the Vatican Council II, a council that has changed the face of the Church for the world today! Let us take to heart the teachings of the Council and experience the depth of the mercy of the Lord.