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: 10/21/2025
Index Date Time (HIMAWARI-9) HIMAWARI-9 Lat,Lon NOAA-21 Lat,Lon Distance(km) Time Diff (sec)
1 10/22/2025 16:15:50 -0.01, 140.70 0.62, 137.76 333.95 80
2 10/23/2025 15:54:23 -0.00, 140.69 -0.38, 142.31 184.61 80
3 10/25/2025 04:16:18 0.00, 140.68 -0.80, 137.01 417.66 80
4 10/26/2025 04:00:11 0.00, 140.66 0.20, 141.55 101.15 80
5 10/27/2025 16:21:56 -0.00, 140.63 1.00, 136.30 494.32 80
6 10/28/2025 16:00:30 -0.00, 140.62 -0.07, 140.83 24.82 80
7 10/31/2025 04:03:38 0.00, 140.58 -0.09, 140.07 57.08 80
8 11/01/2025 03:47:31 0.00, 140.56 0.92, 144.61 462.77 80
9 11/02/2025 16:09:16 -0.00, 140.51 0.26, 139.36 130.94 80
10 11/03/2025 15:47:49 -0.00, 140.48 -0.76, 143.90 389.13 80

Figure of HIMAWARI-9 and NOAA-21 satellite orbits during SNOs since TLE Epoch: 10/21/2025
SNOs_Map_HIMAWARI-9_NOAA-21_20251022.jpg

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

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