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: 8/12/2025
Index Date Time (HIMAWARI-9) HIMAWARI-9 Lat,Lon NOAA-21 Lat,Lon Distance(km) Time Diff (sec)
1 08/13/2025 03:48:38 0.00, 140.76 0.80, 144.31 405.39 80
2 08/14/2025 16:10:25 -0.00, 140.75 0.40, 139.05 194.52 80
3 08/15/2025 15:49:00 0.00, 140.74 -0.62, 143.58 323.40 80
4 08/17/2025 04:10:57 -0.01, 140.70 -0.55, 138.27 276.82 80
5 08/18/2025 03:54:52 -0.01, 140.69 0.48, 142.80 241.53 80
6 08/19/2025 16:16:39 0.01, 140.67 0.73, 137.54 357.34 80
7 08/20/2025 15:55:15 0.02, 140.65 -0.30, 142.07 161.22 80
8 08/22/2025 04:17:11 -0.02, 140.60 -0.85, 136.76 437.90 80
9 08/23/2025 04:01:06 -0.02, 140.58 0.13, 141.30 81.62 80
10 08/25/2025 16:01:30 0.02, 140.51 -0.00, 140.55 4.97 80

Figure of HIMAWARI-9 and NOAA-21 satellite orbits during SNOs since TLE Epoch: 8/12/2025
SNOs_Map_HIMAWARI-9_NOAA-21_20250813.jpg

Download SNOs between HIMAWARI-9 and NOAA-21 since TLE EPOCH: 08/12/2025 in txt file.

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