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: 9/3/2025
Index Date Time (HIMAWARI-9) HIMAWARI-9 Lat,Lon NOAA-21 Lat,Lon Distance(km) Time Diff (sec)
1 09/04/2025 16:16:36 -0.02, 140.77 0.68, 137.55 366.91 80
2 09/05/2025 15:55:11 -0.01, 140.77 -0.31, 142.09 149.68 80
3 09/07/2025 04:17:06 0.02, 140.78 -0.86, 136.78 454.84 80
4 09/08/2025 04:01:01 0.01, 140.77 0.14, 141.32 62.37 80
5 09/10/2025 16:01:23 -0.01, 140.75 0.05, 140.59 19.07 80
6 09/11/2025 15:42:38 -0.01, 140.75 -1.01, 145.12 498.62 80
7 09/13/2025 04:04:32 0.01, 140.74 -0.20, 139.82 105.05 80
8 09/14/2025 03:48:27 0.01, 140.74 0.80, 144.36 412.58 80
9 09/15/2025 16:10:14 -0.02, 140.71 0.38, 139.09 185.26 80
10 09/16/2025 15:48:50 -0.01, 140.70 -0.69, 143.62 332.74 80

Figure of HIMAWARI-9 and NOAA-21 satellite orbits during SNOs since TLE Epoch: 9/3/2025
SNOs_Map_HIMAWARI-9_NOAA-21_20250904.jpg

Download SNOs between HIMAWARI-9 and NOAA-21 since TLE EPOCH: 09/03/2025 in txt file.

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