Fig. 1. Schematic diagram of calculation of earth stray radiation

Fig. 2. Calculation flow of the earth stray radiation

Fig. 3. Schematic diagram of latitude calculation

Fig. 4. Solving geometric models with longitude

Fig. 5. The area where the surface radiation can reach the satellite at different satellite positions

Fig. 6. Earth spherical crown region and its solar zenith angle at different times. （a） 09-23 9:00; （b） 09-23 12:00;（c） 9-23 15:00; （d） 12-22 9:00; （e） 12-22 12:00; （f） 12-22 15:00

Fig. 7. Curve of point source transmission

Fig. 8. Earth stray radiation analysis in the visible light band. (a) Stray radiation curve at different azimuth angles; (b) Stray radiation curve at different elevation angles; (c) Stray radiation curve at different nadir positions

Fig. 9. Earth stray radiation analysis in the long wave infrared band. (a) Stray radiation curve at different azimuth angles; (b) Stray radiation curve at different elevation angles; (c) Stray radiation curve at different nadir positions