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: 9/17/2025
Index Date Time (HIMAWARI-9) HIMAWARI-9 Lat,Lon NOAA-21 Lat,Lon Distance(km) Time Diff (sec)
1 09/18/2025 04:10:46 0.04, 140.73 -0.49, 138.32 274.59 80
2 09/19/2025 03:54:40 0.04, 140.72 0.51, 142.86 243.74 80
3 09/20/2025 16:16:27 -0.04, 140.75 0.67, 137.59 360.78 80
4 09/21/2025 15:55:02 -0.04, 140.74 -0.33, 142.13 157.84 80
5 09/23/2025 04:16:57 0.04, 140.65 -0.83, 136.82 436.04 80
6 09/24/2025 04:00:52 0.04, 140.62 0.18, 141.36 83.40 80
7 09/26/2025 16:01:14 -0.04, 140.62 -0.02, 140.63 2.52 80
8 09/29/2025 04:04:24 0.04, 140.50 -0.07, 139.85 74.32 80
9 09/30/2025 03:48:19 0.04, 140.47 0.94, 144.38 445.61 80
10 10/01/2025 16:10:05 -0.05, 140.48 0.28, 139.12 155.78 80

Figure of HIMAWARI-9 and NOAA-21 satellite orbits during SNOs since TLE Epoch: 9/17/2025
SNOs_Map_HIMAWARI-9_NOAA-21_20250918.jpg

Download SNOs between HIMAWARI-9 and NOAA-21 since TLE EPOCH: 09/17/2025 in txt file.

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