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: 7/10/2025
Index Date Time (HIMAWARI-9) HIMAWARI-9 Lat,Lon NOAA-21 Lat,Lon Distance(km) Time Diff (sec)
1 07/11/2025 04:04:37 0.01, 140.78 -0.23, 139.81 110.99 80
2 07/12/2025 03:48:33 0.01, 140.78 0.77, 144.34 405.37 80
3 07/13/2025 16:10:21 -0.00, 140.77 0.36, 139.06 194.35 80
4 07/14/2025 15:48:57 0.00, 140.77 -0.64, 143.59 322.21 80
5 07/16/2025 04:10:54 -0.00, 140.76 -0.56, 138.29 282.43 80
6 07/17/2025 03:54:49 -0.00, 140.76 0.45, 142.82 234.70 80
7 07/18/2025 16:16:38 0.01, 140.74 0.69, 137.54 363.68 80
8 07/19/2025 15:55:13 0.01, 140.73 -0.31, 142.07 153.36 80
9 07/21/2025 04:17:11 -0.01, 140.73 -0.87, 136.76 451.11 80
10 07/22/2025 04:01:06 -0.02, 140.72 0.13, 141.29 66.43 80
11 07/24/2025 16:04:09 0.03, 140.67 0.06, 140.56 13.11 80

Figure of HIMAWARI-9 and NOAA-21 satellite orbits during SNOs since TLE Epoch: 7/10/2025
SNOs_Map_HIMAWARI-9_NOAA-21_20250711.jpg

Download SNOs between HIMAWARI-9 and NOAA-21 since TLE EPOCH: 07/10/2025 in txt file.

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