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: 10/25/2025
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 10/26/2025 15:18:45 -70.10, 126.63 97.34 10/26/2025 15:19:20 -70.07, 126.67 97.37 3.26 35
2 10/26/2025 16:09:29 69.96, -65.85 82.53 10/26/2025 16:08:47 69.97, -65.84 82.54 1.27 42
3 10/29/2025 06:45:00 70.55, 74.39 84.00 10/29/2025 06:46:10 70.48, 75.51 83.93 42.28 70
4 10/29/2025 07:35:33 -70.02,-117.45 96.53 10/29/2025 07:35:46 -70.04,-117.49 96.51 2.94 13
5 10/29/2025 08:26:18 69.93, 49.99 83.40 10/29/2025 08:25:13 69.93, 50.00 83.40 0.51 65
6 10/31/2025 23:01:42 70.11,-169.12 84.43 10/31/2025 23:02:42 70.13,-169.10 84.45 2.43 60
7 10/31/2025 23:52:23 -69.99, -1.62 95.68 10/31/2025 23:52:12 -70.02, -1.62 95.65 3.49 11
8 11/01/2025 00:42:58 69.38, 166.58 83.73 11/01/2025 00:41:48 69.41, 165.19 83.75 54.62 70
9 11/03/2025 15:18:32 70.10, -53.32 85.27 11/03/2025 15:19:08 70.08, -53.27 85.24 2.98 36
10 11/03/2025 16:09:13 -69.98, 114.19 94.85 11/03/2025 16:08:38 -69.98, 114.22 94.86 0.84 35
11 11/06/2025 06:44:48 -70.75,-105.85 93.29 11/06/2025 06:45:57 -70.66,-104.16 93.37 62.74 69
12 11/06/2025 07:35:21 70.05, 62.56 86.03 11/06/2025 07:35:33 70.05, 62.59 86.03 1.28 12
13 11/06/2025 08:26:02 -69.92,-129.92 94.10 11/06/2025 08:25:03 -69.95,-129.92 94.07 3.40 59

Figure of NOAA-21 and LANDSAT-9 satellite orbits during SNOs since TLE Epoch: 10/25/2025
SNOs_Map_NOAA-21_LANDSAT-9_20251025.jpg

Download SNOs between NOAA-21 and LANDSAT-9 since TLE EPOCH: 10/25/2025 in txt file.

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