What is the distance between the sea level and the earth's center? Is the sea level at the equator the same as that at the North Pole? We are used to saying that there is a unified altitude of 0 in the world. What is the distance between the altitude of 0 and the center of the earth, So can the distance between point a and the geocenter be calculated by X + the distance from 0 to the geocenter? Can the distance between point B and the geocenter be calculated by X + the distance from 0 to the geocenter?

What is the distance between the sea level and the earth's center? Is the sea level at the equator the same as that at the North Pole? We are used to saying that there is a unified altitude of 0 in the world. What is the distance between the altitude of 0 and the center of the earth, So can the distance between point a and the geocenter be calculated by X + the distance from 0 to the geocenter? Can the distance between point B and the geocenter be calculated by X + the distance from 0 to the geocenter?

1. Definition of sea level: it refers to the level that the ocean can maintain at a certain time without the sea level fluctuation caused by tides, waves, surges or other disturbance factors. The first requirement is to filter out tides. LS is not accurate. In practical application, sea level is usually measured with long-term (generally more than 19 years) tide observation data