For a simple pendulum (regarded as a simple pendulum), the period T=2π (L/g), where L is the pendulum length, G is the frequency of gravity acceleration, and f= 1/T, and both the period and frequency are related to the length of the cycloid. The earliest unit of time used by humans was the day. The earliest tool to measure time by the sun was the sundial.
According to the different timing methods, water clocks can be divided into two types: water receiving clocks and water discharging clocks. The dripping speed of the "water clock" is related to the size of the dripping hole and the water level of the water outlet container. The speed of the pendulum is related to the length of the pendulum (the longer the pendulum, the slower it swings, the shorter the pendulum, the faster it swings).
Pendulum speed in mathematics
The speed of a pendulum has nothing to do with its weight and happiness. Because the pendulum has a certain length and its swing speed is constant, it can be used to time. When adjusting the pendulum clock, it is fast, and the pendulum length should be lengthened; Slow down, we should shorten the swing length.
In ancient China, a day and night was divided into 12 hours, and now every hour is 2 hours. At the same time, the time is different around the world. In order to facilitate people to travel and time, an international standard time zone has been set up, which divides the world into 24 time zones. In China, the time in East Zone 8 where Beijing is located is used as the standard time zone, which is called Beijing time.