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: 11/21/2025
Index Date Time (HIMAWARI-9) HIMAWARI-9 Lat,Lon NOAA-21 Lat,Lon Distance(km) Time Diff (sec)
1 11/22/2025 03:54:12 -0.02, 140.77 0.46, 143.04 258.88 80
2 11/23/2025 16:16:03 0.02, 140.79 0.71, 137.77 345.16 80
3 11/24/2025 15:54:40 0.01, 140.81 -0.32, 142.29 168.40 80
4 11/26/2025 04:16:41 -0.01, 140.84 -0.84, 136.97 440.49 80
5 11/27/2025 04:00:37 0.00, 140.85 0.13, 141.50 73.82 80
6 11/29/2025 16:03:45 -0.00, 140.87 0.01, 140.74 13.91 80
7 12/02/2025 04:04:21 -0.01, 140.89 -0.24, 139.96 106.50 80
8 12/03/2025 03:48:18 -0.01, 140.90 0.79, 144.48 408.64 80
9 12/04/2025 16:10:09 0.02, 140.90 0.38, 139.21 192.65 80
10 12/05/2025 15:48:45 0.01, 140.91 -0.60, 143.74 322.26 80

Figure of HIMAWARI-9 and NOAA-21 satellite orbits during SNOs since TLE Epoch: 11/21/2025
SNOs_Map_HIMAWARI-9_NOAA-21_20251122.jpg

Download SNOs between HIMAWARI-9 and NOAA-21 since TLE EPOCH: 11/21/2025 in txt file.

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