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: 9/11/2025
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 09/13/2025 22:12:03 -70.56, 22.61 112.94 09/13/2025 22:13:13 -70.44, 23.68 113.08 42.04 70
2 09/13/2025 23:02:39 70.03,-169.25 66.53 09/13/2025 23:02:46 70.01,-169.29 66.51 2.49 7
3 09/13/2025 23:53:21 -69.94, -1.80 113.55 09/13/2025 23:52:15 -69.95, -1.74 113.54 2.50 66
4 09/16/2025 14:28:47 -70.11, 139.10 112.38 09/16/2025 14:29:47 -70.11, 139.09 112.38 0.65 60
5 09/16/2025 15:19:31 69.99, -53.42 67.52 09/16/2025 15:19:14 70.01, -53.42 67.54 1.61 17
6 09/16/2025 16:10:03 -69.37, 114.81 113.10 09/16/2025 16:08:53 -69.40, 113.39 113.05 55.78 70
7 09/19/2025 06:45:40 -70.08,-105.08 111.38 09/19/2025 06:46:16 -70.09,-105.05 111.36 1.98 36
8 09/19/2025 07:36:24 69.96, 62.41 68.52 09/19/2025 07:35:43 69.98, 62.44 68.55 3.00 41
9 09/21/2025 22:11:59 70.56,-157.37 70.15 09/21/2025 22:13:09 70.49,-156.22 70.06 43.38 70
10 09/21/2025 23:02:33 -70.05, 10.74 110.37 09/21/2025 23:02:45 -70.06, 10.78 110.36 1.83 12
11 09/21/2025 23:53:17 69.93, 178.23 69.53 09/21/2025 23:52:12 69.95, 178.27 69.55 2.38 65
12 09/24/2025 14:28:44 70.11, -40.90 70.73 09/24/2025 14:29:44 70.11, -40.89 70.72 0.40 60
13 09/24/2025 15:19:26 -70.03, 126.55 109.35 09/24/2025 15:19:14 -70.01, 126.60 109.37 2.91 12
14 09/24/2025 16:09:59 69.33, -65.11 69.96 09/24/2025 16:08:50 69.40, -66.59 70.04 58.79 69

Figure of NOAA-21 and LANDSAT-9 satellite orbits during SNOs since TLE Epoch: 9/11/2025
SNOs_Map_NOAA-21_LANDSAT-9_20250912.jpg

Download SNOs between NOAA-21 and LANDSAT-9 since TLE EPOCH: 09/11/2025 in txt file.

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