Simultaneous Nadir Overpasses (SNOs) Predictions

Prediction of SNOs between NOAA-21 and LANDSAT-9 Satellite Orbit:

Table of predicted SNOs for the next 14.0 days since TLE Epoch: 10/8/2025
Index Date (NOAA-21) Time (NOAA-21) Lat,Lon (NOAA-21) SZA (NOAA-21 ) Date (LANDSAT-9) Time (LANDSAT-9) Lat,Lon (LANDSAT-9) SZA (LANDSAT-9 ) Distance(km) Time Diff (sec)
1 10/10/2025 14:28:37 70.67, -41.71 77.46 10/10/2025 14:29:46 70.56, -40.27 77.34 54.48 69
2 10/10/2025 15:19:08 -70.04, 126.61 103.17 10/10/2025 15:19:23 -70.07, 126.64 103.15 3.14 15
3 10/10/2025 16:09:52 69.89, -65.86 76.70 10/10/2025 16:08:51 69.91, -65.94 76.71 3.26 61
4 10/13/2025 06:45:18 70.12, 74.96 77.90 10/13/2025 06:46:24 70.13, 74.98 77.91 1.72 66
5 10/13/2025 07:35:59 -70.00,-117.55 102.20 10/13/2025 07:35:54 -70.02,-117.54 102.19 2.23 5
6 10/13/2025 08:26:38 69.60, 50.37 77.40 10/13/2025 08:25:26 69.64, 49.57 77.45 31.25 72
7 10/15/2025 23:02:08 70.09,-169.21 78.87 10/15/2025 23:02:53 70.11,-169.17 78.88 2.55 45
8 10/15/2025 23:52:49 -69.98, -1.72 101.24 10/15/2025 23:52:24 -69.95, -1.76 101.27 3.28 25
9 10/18/2025 15:18:59 70.07, -53.40 79.83 10/18/2025 15:19:23 70.06, -53.36 79.81 2.13 24
10 10/18/2025 16:09:40 -69.96, 114.10 100.28 10/18/2025 16:08:53 -69.96, 114.13 100.28 1.12 47
11 10/21/2025 06:45:10 -70.41,-105.44 98.89 10/21/2025 06:46:22 -70.31,-104.76 98.99 27.50 72
12 10/21/2025 07:35:49 70.01, 62.49 80.73 10/21/2025 07:35:52 70.03, 62.48 80.74 2.05 3
13 10/21/2025 08:26:31 -69.95,-130.09 99.33 10/21/2025 08:25:22 -69.93,-130.02 99.35 3.16 69

Figure of NOAA-21 and LANDSAT-9 satellite orbits during SNOs since TLE Epoch: 10/8/2025
SNOs_Map_NOAA-21_LANDSAT-9_20251008.jpg

Download SNOs between NOAA-21 and LANDSAT-9 since TLE EPOCH: 10/08/2025 in txt file.

Historial Predications of SNOs between NOAA-21 and LANDSAT-9