Gravity is the force that an object receives from the earth, and it is determined by the attraction of the earth and the centrifugal force due to its rotation. In the vicinity of the equator, the centrifugal force increases and it decreases slightly. On the other hand, when there are many high density substances in the ground, it increases. For example, in Okinawa, which has a latitude lower than that of Hokkaido, it becomes slightly lighter when measured with the same scale. Updated "Gravity value" which is the reference measured in various places in Japan for the first time in 40 years Do you know that the value of gravity is different depending on the place on the earth? In Sado-shi, Niigata prefecture where the fluctuation was the largest, people who weigh 60 kg are lighter by about 0.006 g than 40 years ago.
