The Regina Caeli or Regina Coeli ("Queen of Heaven"), an ancient latin Marian Hymn of the Christian Church, is one of the four seasonal Marian antiphons of the Blesse Virgin Mary, prescribed to be sung or recited in the Liturgy of the Hours at the conclusion of the last of the hours to be prayed in common that day, typically night prayer (Compline or Vespers). The Regina Caeli is sung or recited in place of the angelus during the Easter season, from Holy Saturday through Pentecost Sunday. The Latin word coelum, derives from the Greek word κοίλον, koilon, hollow, and refers to the heavens as the vast "hollow" above the earth.