When the sun passes trough the Brunelleschi’s Cupola In 1475 the Florentine Mathematics Paolo dal Pozzo Toscanelli built the gnomon, an astronomical indicator to measure the exact position of the sun. The sun penetrates the lantern’s window and passes trough the gnomon; then the sun’s rays pass through small bronze hole of just 4 centimeters in diameter and form a disk of light that hits the marble floor of the Duomo. Where the sun touches the floor inside the Chapel…
