Question

Which astronomer discovered that motion of a pendulum is periodic​

Answer 1

Answer:

Galileo's

1602: Galileo's research

Galileo discovered the crucial property that makes pendulums useful as timekeepers, called isochronism; the period of the pendulum is approximately independent of the amplitude or width of the swing.

Answer 2

Answer:

Galileo discovered that motion of a pendulum is periodic.