User talk:Gubbinal

In the section on use of the pendulum as a length standard, it is stated that the downward acceleration of free fall at sea level increases smoothly with latitude, starting at the equator. So far so good. But this effect is attributed to the oblateness of the earth, which is incorrect. The major cause is the centrifugal force due to the earth's rotation. This is well known. A simple yet adequate explanation can be found here. Gubbinal (talk) 15:16, 11 September 2019 (UTC)