We have explained this being due to light in the red spectrum bending readily, so red light is bent first over the horizon by the gravity of Earth where light in the other spectrums is not so bend.
Light in this spectrum, leaving the Sun in all directions, is bent by the gravity of Earth so that what would normally pass on either side of the Earth is bent back toward the center of the Earth.
这个光谱中的光线，向四面八方离开太阳，由于地球引力弯曲导致本该从地球旁边经过的光线弯向地球的中心。
3
Formulas of inversion and cosine transform spectrum of gravity anomaly of sphere, infinite horizontal cylinder, infinite and finite stretched staircase were deduced.