A circular receptacle with glass sides, metal circled with gold or gilded metal to hold the Sacred Host upright in the monstrance. It is a sacred vessel, having received the priest's blessing. It is sometimes called a lunette. (Etym. Latin luna, moon.)
I thought the capsula and the luna were the same thing, but apparently not. Perhaps some clergy or someone more knowledgeable than me on board could clarify. Perhaps the capsula holds the luna?
Thank you.