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: 7/12/2025
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 07/14/2025 13:38:30 71.11, -29.87 49.59 07/14/2025 13:39:36 71.01, -27.17 49.37 98.20 66
2 07/14/2025 14:28:54 -70.08, 139.11 131.51 07/14/2025 14:29:21 -70.08, 139.07 131.51 1.56 27
3 07/14/2025 15:19:38 69.96, -53.40 48.37 07/14/2025 15:18:48 69.98, -53.43 48.40 2.18 50
4 07/17/2025 05:55:10 70.27, 87.26 49.13 07/17/2025 05:56:21 70.25, 87.55 49.08 11.29 71
5 07/17/2025 06:45:50 -70.07,-105.11 131.08 07/17/2025 06:45:52 -70.09,-105.04 131.07 3.04 2
6 07/17/2025 07:36:33 69.91, 62.45 48.76 07/17/2025 07:35:20 69.92, 62.37 48.79 3.43 73
7 07/19/2025 22:12:02 70.12,-156.73 49.45 07/19/2025 22:12:53 70.12,-156.75 49.45 0.87 51
8 07/19/2025 23:02:44 -70.01, 10.75 130.66 07/19/2025 23:02:23 -70.02, 10.75 130.64 1.00 21
9 07/19/2025 23:53:11 69.01, 179.51 48.30 07/19/2025 23:52:05 69.08, 177.12 48.48 95.72 66
10 07/22/2025 14:28:57 70.07, -40.89 49.92 07/22/2025 14:29:24 70.10, -40.90 49.94 2.93 27
11 07/22/2025 15:19:40 -70.01, 126.51 130.13 07/22/2025 15:18:54 -70.00, 126.59 130.14 3.28 46
12 07/25/2025 05:55:14 -70.43, -92.99 129.14 07/25/2025 05:56:25 -70.34, -92.32 129.27 27.17 71
13 07/25/2025 06:45:53 70.08, 74.86 50.50 07/25/2025 06:45:55 70.06, 74.92 50.47 3.33 2
14 07/25/2025 07:36:35 -69.96,-117.64 129.62 07/25/2025 07:35:25 -69.96,-117.58 129.62 2.32 70

Figure of NOAA-21 and LANDSAT-9 satellite orbits during SNOs since TLE Epoch: 7/12/2025
SNOs_Map_NOAA-21_LANDSAT-9_20250712.jpg

Download SNOs between NOAA-21 and LANDSAT-9 since TLE EPOCH: 07/12/2025 in txt file.

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