Influence Factors of Gravitational Acceleration near the Earth

Objects on the earth are subject to gravity due to universal gravitation. This paper systematically studies the influence factors, including latitude, altitude, depth inside the earth, surrounding stars, on gravitational acceleration of object near the earth. The results show that latitude has a relatively large impact on gravitational acceleration; depth and altitude have the greatest impact on gravitational acceleration. The orbit and the position of the object (dayside or nightside of the earth) have little effect on the gravitational acceleration of the object. Our work can offer reference for accurate calculation of gravity acceleration.