Earth's gravity, gravity potential. Historical development of Gravimetry. Methods of gravimetric determination. Determining the acceleration of the Earth's gravity is based on the principle of free fall. Determining the acceleration of the Earth's gravity is based on the principle of physical pendulum. Dynamic and static methods for determining the acceleration of the Earth's gravity are more difficult. Sources of errors and the accuracy of determining the acceleration of the Earth's gravity are more difficult. Instruments for determining the acceleration of the Earth's gravity are more difficult. Ballistic instruments. Absolute gravitator. Relative gravitator. Gravimetric surveying. Gravimetric networks. Applying the acceleration of Earth's gravity in time. Satellite gravimetric methods and missions.