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: 10/17/2025
Index Date Time (HIMAWARI-9) HIMAWARI-9 Lat,Lon NOAA-21 Lat,Lon Distance(km) Time Diff (sec)
1 10/18/2025 15:48:17 -0.03, 140.75 -0.73, 143.77 345.29 80
2 10/20/2025 04:10:11 0.03, 140.75 -0.45, 138.48 258.21 80
3 10/21/2025 03:54:05 0.03, 140.74 0.54, 143.02 259.86 80
4 10/22/2025 16:15:49 -0.01, 140.72 0.68, 137.77 336.30 80
5 10/23/2025 15:54:24 -0.00, 140.71 -0.38, 142.30 181.95 80
6 10/25/2025 04:18:57 -0.01, 140.71 -0.86, 137.02 420.83 80
7 10/26/2025 03:57:31 -0.00, 140.70 0.20, 141.55 97.60 80
8 10/27/2025 16:21:56 0.01, 140.67 1.00, 136.30 497.87 80
9 10/28/2025 16:00:30 0.00, 140.65 -0.07, 140.83 20.91 80
10 10/31/2025 04:06:17 -0.00, 140.62 -0.15, 140.08 62.26 80

Figure of HIMAWARI-9 and NOAA-21 satellite orbits during SNOs since TLE Epoch: 10/17/2025
SNOs_Map_HIMAWARI-9_NOAA-21_20251018.jpg

Download SNOs between HIMAWARI-9 and NOAA-21 since TLE EPOCH: 10/17/2025 in txt file.

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