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: 4/2/2025
Index Date Time (HIMAWARI-9) HIMAWARI-9 Lat,Lon NOAA-21 Lat,Lon Distance(km) Time Diff (sec)
1 04/03/2025 16:03:33 0.03, 140.79 0.01, 140.74 6.28 80
2 04/06/2025 04:04:01 -0.04, 140.78 -0.23, 139.99 91.47 80
3 04/07/2025 03:47:55 -0.04, 140.78 0.81, 144.51 426.06 80
4 04/08/2025 16:09:41 0.05, 140.77 0.38, 139.26 172.86 80
5 04/09/2025 15:48:14 0.05, 140.76 -0.60, 143.80 345.12 80
6 04/11/2025 04:10:08 -0.05, 140.74 -0.57, 138.50 255.94 80
7 04/12/2025 03:54:03 -0.05, 140.73 0.49, 143.03 262.71 80
8 04/13/2025 16:15:48 0.05, 140.71 0.70, 137.77 334.61 80
9 04/14/2025 15:54:22 0.05, 140.69 -0.29, 142.31 184.13 80
10 04/16/2025 04:16:16 -0.05, 140.66 -0.85, 137.01 416.15 80

Figure of HIMAWARI-9 and NOAA-21 satellite orbits during SNOs since TLE Epoch: 4/2/2025
SNOs_Map_HIMAWARI-9_NOAA-21_20250403.jpg

Download SNOs between HIMAWARI-9 and NOAA-21 since TLE EPOCH: 04/02/2025 in txt file.

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