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: 10/19/2025
Index Date Time (HIMAWARI-9) HIMAWARI-9 Lat,Lon NOAA-21 Lat,Lon Distance(km) Time Diff (sec)
1 10/20/2025 04:10:11 0.03, 140.75 -0.48, 138.49 258.16 80
2 10/21/2025 03:54:04 0.03, 140.74 0.51, 143.03 259.78 80
3 10/22/2025 16:15:49 -0.02, 140.72 0.65, 137.77 336.86 80
4 10/23/2025 15:54:23 -0.02, 140.71 -0.35, 142.31 181.36 80
5 10/25/2025 04:18:57 0.01, 140.71 -0.83, 137.02 421.41 80
6 10/26/2025 03:57:31 0.01, 140.70 0.18, 141.56 96.99 80
7 10/27/2025 16:21:56 -0.00, 140.67 0.96, 136.29 498.65 80
8 10/28/2025 16:00:30 -0.01, 140.66 -0.05, 140.83 19.84 80
9 10/31/2025 04:06:17 0.01, 140.63 -0.11, 140.08 63.12 80
10 11/01/2025 03:44:51 0.01, 140.61 0.90, 144.62 456.20 80
11 11/02/2025 16:09:15 -0.01, 140.57 0.28, 139.36 137.55 80

Figure of HIMAWARI-9 and NOAA-21 satellite orbits during SNOs since TLE Epoch: 10/19/2025
SNOs_Map_HIMAWARI-9_NOAA-21_20251020.jpg

Download SNOs between HIMAWARI-9 and NOAA-21 since TLE EPOCH: 10/19/2025 in txt file.

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