Meridian Line of Basilica di San Petronio
Wheelchair accessible
A massive line stretching across the floor of Bologna’s largest church, created by a 17th-century scientist to measure the movements of the Sun.

📜 A 67-meter brass strip in Bologna's Basilica di San Petronio.
🔍 Designed by astronomer Giovanni Domenico Cassini in 1655 to precisely measure the Sun's movements.

Why Go

🔭 Witness a historical astronomical instrument
🏛️ Explore Bologna's largest Gothic church
☀️ See the Sun's image projected at midday
🚶‍♀️ Step-free access available

Why Avoid

🚫 Dress code enforced (shoulders/knees covered)
🅿️ Limited parking in city center

Tips

⏱️ Best to visit around midday to see the sundial in action
🚶 Easily reachable on foot or by bus

Cost

💰 Free admission to church interior and sundial viewing.
💰 Fees apply for other parts of the church (e.g., Chapel of Re Magi).

Hours

🕒 Basilica: Daily 8:30 a.m.

  • 1 p.m. and 2:30 p.m.
  • 6 p.m.
    🕒 Museum: Daily 8:30 a.m.
  • 12:15 p.m. and 2:30 p.m.
  • 5:15 p.m.

Location

📍 South side of Piazza Maggiore, Bologna.

Last updated 1 day ago

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