Fig. 1. Light path model of stellar light passing through two layers of atmosphere

Fig. 2. Stellar ray incidence model

Fig. 3. Light path model that only passes through the atmosphere of the Nth layer

Fig. 4. Iterative forward feedback algorithm flow chart

Fig. 5. Comparison of atmospheric refractive index and theoretical atmospheric refractive index obtained from all data

Fig. 6. Comparison of atmospheric refractive index and theoretical atmospheric refractive index obtained from three consecutive days data

Fig. 7. Distribution of error values