Transit scheme. Labels “S” and “T” mark the centers of a stellar disk (yellow) and transiter’s disk (blue), respectively.The contact point “c” of the disks corresponds to the transit start (or end) time, i.e., the time moment Δt_s or Δt_e. The center of the transiting body moves along the visible trajectory from "T" to “M” (or vise versa), where “M” is the middle point of the trajectory.