Scattering geometry for a MC located in front or behind the Sgr A* plane. The two positions depicted have scattering angles θ and π − θ, which result in the same polarization degree. In addition, d_proj is the cloud-Sgr A* distance projected in the plane of the sky, d_los is the line-of-sight distance of the cloud with respect to the Sgr A* plane, c is the speed of light, and t_light is light travel time between Sgr A* and the cloud. The vector d_los assumes negative values if the cloud is in front of the Sgr A* plane and positive if behind.