Slow Motion Of Huge Foucault's Pendulum In The Premises Of The Ancient Planetarium Bell Tower, Frombork, Poland

slow motion huge foucaults pendulum filefoucault pendulum ancient planetarium bell tower frombork poland cathedral hill radziejowski museum belfry closeup ball education science experiment swing astronomy scientific observatory physics earth cathedral interior suspended inside indoor travel tourism architecture landmark radziejowski tower foucault rotation building round symbol demonstration history gravity european french compass circle sphere