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: 8/17/2025
Index Date Time (HIMAWARI-9) HIMAWARI-9 Lat,Lon NOAA-21 Lat,Lon Distance(km) Time Diff (sec)
1 08/18/2025 03:54:52 0.01, 140.76 0.45, 142.81 233.00 80
2 08/19/2025 16:16:40 -0.01, 140.77 0.70, 137.53 368.53 80
3 08/20/2025 15:55:14 -0.00, 140.77 -0.27, 142.07 147.90 80
4 08/22/2025 04:17:11 0.00, 140.76 -0.89, 136.77 455.42 80
5 08/23/2025 04:01:06 -0.00, 140.76 0.15, 141.29 61.92 80
6 08/25/2025 16:04:09 0.00, 140.73 0.03, 140.56 19.74 80
7 08/26/2025 15:42:45 0.00, 140.72 -1.00, 145.09 498.06 80
8 08/28/2025 04:04:40 -0.00, 140.70 -0.20, 139.79 103.37 80
9 08/29/2025 03:48:35 -0.00, 140.68 0.84, 144.31 414.95 80
10 08/30/2025 16:10:23 0.01, 140.66 0.38, 139.05 182.96 80
11 08/31/2025 15:48:58 0.01, 140.64 -0.66, 143.58 335.37 80

Figure of HIMAWARI-9 and NOAA-21 satellite orbits during SNOs since TLE Epoch: 8/17/2025
SNOs_Map_HIMAWARI-9_NOAA-21_20250818.jpg

Download SNOs between HIMAWARI-9 and NOAA-21 since TLE EPOCH: 08/17/2025 in txt file.

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