Dies Domini is an apostolic letter promulgated by Pope John Paul II

Pope John Paul II

Blessed Pope John Paul II , born Karol Józef Wojtyła , reigned as Pope of the Catholic Church and Sovereign of Vatican City from 16 October 1978 until his death on 2 April 2005, at of age. His was the second-longest documented pontificate, which lasted ; only Pope Pius IX ...

 on July 30,1998. In this doctrine, Pope John Paul encourages the Catholic population to 'rediscover the meaning' behind keeping the Lord's Day

Lord's Day

Lord's Day is a Christian name for Sunday, the day of communal worship. It is observed by most Christians as the weekly memorial of the resurrection of Jesus Christ, who is said in the four canonical Gospels of the New Testament to have been witnessed alive from the dead early on the first day of...

 holy. “

It is the day which recalls in grateful adoration the world’s first day and looks forward in active hope to the ‘last day,’ when Christ will come in glory

Second Coming

In Christian doctrine, the Second Coming of Christ, the Second Advent, or the Parousia, is the anticipated return of Jesus Christ from Heaven, where he sits at the Right Hand of God, to Earth. This prophecy is found in the canonical gospels and in most Christian and Islamic eschatologies...

 and all things will be made new.” Some think every seven days, the Church celebrates the Easter

Easter

Easter is the central feast in the Christian liturgical year. According to the Canonical gospels, Jesus rose from the dead on the third day after his crucifixion. His resurrection is celebrated on Easter Day or Easter Sunday...

 mystery, rather than the traditional once per year. This is a tradition going back to the Apostles

Apostle (Christian)

The term apostle is derived from Classical Greek ἀπόστολος , meaning one who is sent away, from στέλλω + από . The literal meaning in English is therefore an "emissary", from the Latin mitto + ex...

, taking its origin from the actual day of Christ’s Resurrection

Resurrection of Jesus

The Christian belief in the resurrection of Jesus states that Jesus returned to bodily life on the third day following his death by crucifixion. It is a key element of Christian faith and theology and part of the Nicene Creed: "On the third day he rose again in fulfillment of the Scriptures"...

—a day thus appropriately designated “ the Lord’s Day.”