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Cassini's Sun calendar in the Basilica of San Petronio
Cassini's Sun calendar in the Basilica of San Petronio
Copyright: Calter Photo Show in archive: false
In this Sun calendar, a hole in the ceiling of the cathedral projects a shaft of sunlight onto this bronze strip on the pavement below which is engraved with the days of the year and signs of the zodiac.
The Basilica of San Petronio is in Bologna, Italy.