# Sunday ## Catechism of the Catholic Church The "Lord's Day," the principal day of the week for the Eucharistic celebration of the Church. Each Sunday Mass commemorates the resurrection of Christ on the first Easter Sunday, and is a reminder of the first day of creation for those who have become a "new creation in Christ" ([[2.1.2.1.p39#^ccc-1166|1166]], [[3.2.1.3.p7o#^ccc-2174|2174]], [[3.2.1.3.p7o#^ccc-2180|2180]]). ## Vatican II - Sunday (the Lord's Day) — "the Lord's day is the original feast day, and it should be proposed to the piety of the faithful" — [[sc-05#^sc-106|SC ¶106]]