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: 8/18/2025
Index Date Time (HIMAWARI-9) HIMAWARI-9 Lat,Lon NOAA-21 Lat,Lon Distance(km) Time Diff (sec)
1 08/19/2025 16:16:39 -0.01, 140.77 0.74, 137.54 368.64 80
2 08/20/2025 15:55:15 -0.01, 140.77 -0.29, 142.07 147.73 80
3 08/22/2025 04:17:11 0.00, 140.76 -0.87, 136.76 455.54 80
4 08/23/2025 04:01:06 0.00, 140.76 0.10, 141.30 61.74 80
5 08/25/2025 16:04:09 -0.00, 140.74 0.02, 140.56 20.21 80
6 08/26/2025 15:42:44 -0.00, 140.72 -0.96, 145.10 497.66 80
7 08/28/2025 04:04:40 -0.00, 140.70 -0.19, 139.79 103.74 80
8 08/29/2025 03:48:35 -0.00, 140.68 0.79, 144.33 414.55 80
9 08/30/2025 16:10:23 0.01, 140.66 0.37, 139.05 183.53 80
10 08/31/2025 15:48:59 0.01, 140.65 -0.67, 143.58 334.77 80

Figure of HIMAWARI-9 and NOAA-21 satellite orbits during SNOs since TLE Epoch: 8/18/2025
SNOs_Map_HIMAWARI-9_NOAA-21_20250819.jpg

Download SNOs between HIMAWARI-9 and NOAA-21 since TLE EPOCH: 08/18/2025 in txt file.

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