Second Pendulum
The oscillation half period is one second. The pendulum arm length s is determined by the formula.
g = gravity acceleration
L = g / π2
g = in Finland, Helsinki 9,82 m/s2 => L = 99,49 cm
g = 45o latitude 9,805 m/s2 => L = 99,34 cm
g = equator 9,78 m/s2 => L = 99,01 cm
On the Earth
However, calculating is not as simple as shown before, because it is affected also to the place on the sea, mountains etc.
According to the Bureau International de Poids et Mesures, International Systems of Units (SI), the Earth's standard acceleration due to gravity is:
g = 9.80665 m/s² = 32.1740 ft/s²
Gravity acceleration on the Earth
X marking on the map in the Southern-Finland
Jost Bürgi had probably noticed the independence of the pendulum's oscillation period from the oscillation angle even before Galileo Galilei and built a pendulum clock at the end of the 16th century.
6.8.2015*23:50 (1249 - 1248)
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