On June 21, every year, the sun is directly overhead at noon, is the summer solstice. Adriano knew astronomy and built a temple to all the gods and the sun: the Pantheon. Every year, on June 21, the sun enters from the oculus at the top of the vault, and starts the celebration of the sun. Every year I try not to miss the appointment with "The Feast of the Sun" to the Pantheon where you can do the portraits in the oldest studio laying.