عنوان مقاله [English]
نویسنده [English]چکیده [English]
Anyone who has not seen photos of astronauts in suspended state on their spaceships is aware that many biological, chemical or medical experiments (for example, on the Spacelabs) have been carried out in a weightless state. Specifically, this weightlessness occurs at the point of the center of gravity (i.e., only one point inside the spaceship); in other points there is a small and measurable acceleration relative to this point. This is caused by gravity of the earth. In fact, satellite gravimetry is the measurement of relative acceleration. The goal of gravimetry is to measure gravity on the earth with such measurements in the spaceship.