It's a prayer that honors the Virgin Mary and seeks her intercession. The precise timing of when it is actually prayed may possibly differ based on specific or Local community tactics. The hymn is sung (using the English translation "Hail, Holy Queen enthroned over") by a choir of nuns in https://encapsuladosvip.com/vita-pro-nobis-descubra-os-beneficios-dessa-incrivel-planta-medicinal/