
Foucault Pendulum for Demonstrating the Earth's Rotation
1988
1988
1990
1988-1990
1990
1990
1990
1990s
1990-1991
1989
1990-1991
1989
1989
2000-100
2000-100 BCE
1988
1990
1988
circa 1990
1988
1988
1987
1990
1990s
1990
1987
1987
1839 (original); circa 1988 (replica)
1990
4000-2001 BCE
1989
1989
1991
1990-95
1991
1991
1990
1990
early 1990s
1991
1989
1990
1987
1988
1991
1991
1991
1991
1987
1991
1990