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: 7/21/2025
Index Date Time (HIMAWARI-9) HIMAWARI-9 Lat,Lon NOAA-21 Lat,Lon Distance(km) Time Diff (sec)
1 07/22/2025 04:01:06 0.04, 140.77 0.16, 141.29 59.54 80
2 07/24/2025 16:04:09 -0.05, 140.80 0.03, 140.56 27.85 80
3 07/25/2025 15:42:45 -0.05, 140.79 -0.98, 145.09 488.87 80
4 07/27/2025 04:04:42 0.05, 140.75 -0.19, 139.78 111.66 80
5 07/28/2025 03:48:37 0.05, 140.74 0.82, 144.31 405.95 80
6 07/29/2025 16:10:26 -0.05, 140.75 0.32, 139.03 195.21 80
7 07/30/2025 15:49:01 -0.05, 140.73 -0.69, 143.56 322.56 80
8 08/01/2025 04:10:59 0.05, 140.69 -0.47, 138.25 276.91 80
9 08/02/2025 03:54:54 0.05, 140.67 0.55, 142.78 241.36 80
10 08/03/2025 16:16:41 -0.06, 140.66 0.66, 137.52 358.77 80
11 08/04/2025 15:55:17 -0.06, 140.64 -0.36, 142.05 159.36 80

Figure of HIMAWARI-9 and NOAA-21 satellite orbits during SNOs since TLE Epoch: 7/21/2025
SNOs_Map_HIMAWARI-9_NOAA-21_20250722.jpg

Download SNOs between HIMAWARI-9 and NOAA-21 since TLE EPOCH: 07/21/2025 in txt file.

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