Simultaneous Nadir Overpasses (SNOs) Predictions

Prediction of SNOs between HIMAWARI-9 and NOAA-21 Satellite Orbit:

Table of predicted SNOs for the next 14.0 days since TLE Epoch: 10/8/2025
Index Date Time (HIMAWARI-9) HIMAWARI-9 Lat,Lon NOAA-21 Lat,Lon Distance(km) Time Diff (sec)
1 10/09/2025 04:16:41 0.01, 140.65 -0.84, 136.91 427.27 80
2 10/10/2025 04:00:35 0.01, 140.62 0.20, 141.44 93.79 80
3 10/12/2025 16:00:55 -0.01, 140.59 -0.04, 140.71 13.60 80
4 10/15/2025 04:04:04 0.01, 140.43 -0.11, 139.95 54.76 80
5 10/16/2025 03:47:58 0.01, 140.38 0.93, 144.48 467.42 80
6 10/17/2025 16:09:44 -0.01, 140.37 0.25, 139.22 130.92 80
7 10/18/2025 15:48:18 -0.01, 140.32 -0.80, 143.75 391.42 80
8 10/20/2025 04:10:12 0.01, 140.18 -0.39, 138.46 196.83 80
9 10/21/2025 03:54:07 0.01, 140.13 0.66, 142.99 326.51 80
10 10/22/2025 16:15:52 -0.01, 140.10 0.51, 137.73 269.49 80

Figure of HIMAWARI-9 and NOAA-21 satellite orbits during SNOs since TLE Epoch: 10/8/2025
SNOs_Map_HIMAWARI-9_NOAA-21_20251009.jpg

Download SNOs between HIMAWARI-9 and NOAA-21 since TLE EPOCH: 10/08/2025 in txt file.

Historical Predications of SNOs between HIMAWARI-9 and NOAA-21