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: 10/20/2025
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 10/21/2025 06:45:10 -70.45,-105.51 98.85 10/21/2025 06:46:21 -70.31,-104.76 98.99 31.89 71
2 10/21/2025 07:35:49 70.04, 62.44 80.76 10/21/2025 07:35:51 70.05, 62.50 80.76 2.34 2
3 10/21/2025 08:26:30 -69.94,-130.08 99.34 10/21/2025 08:25:21 -69.93,-130.03 99.35 2.29 69
4 10/23/2025 23:01:54 -70.09, 10.85 98.27 10/23/2025 23:02:53 -70.07, 10.78 98.29 3.53 59
5 10/23/2025 23:52:39 70.00, 178.29 81.66 10/23/2025 23:52:19 70.02, 178.35 81.67 2.73 20
6 10/24/2025 00:43:09 -69.31, -13.37 99.02 10/24/2025 00:41:59 -69.36, -14.92 98.98 61.02 70
7 10/26/2025 15:18:44 -70.06, 126.70 97.39 10/26/2025 15:19:20 -70.06, 126.66 97.38 1.71 36
8 10/26/2025 16:09:29 69.97, -65.87 82.55 10/26/2025 16:08:47 69.95, -65.86 82.52 2.35 42
9 10/29/2025 06:45:01 70.57, 74.36 84.02 10/29/2025 06:46:11 70.45, 75.47 83.90 43.48 70
10 10/29/2025 07:35:33 -70.03,-117.47 96.51 10/29/2025 07:35:46 -70.01,-117.52 96.54 2.86 13
11 10/29/2025 08:26:17 69.90, 50.04 83.37 10/29/2025 08:25:13 69.90, 49.96 83.36 2.91 64
12 10/31/2025 23:01:42 70.14,-169.16 84.46 10/31/2025 23:02:41 70.13,-169.09 84.45 3.12 59
13 10/31/2025 23:52:23 -70.02, -1.66 95.66 10/31/2025 23:52:11 -70.03, -1.60 95.65 2.64 12
14 11/01/2025 00:42:57 69.36, 166.62 83.70 11/01/2025 00:41:47 69.41, 165.20 83.75 55.96 70

Figure of NOAA-21 and LANDSAT-9 satellite orbits during SNOs since TLE Epoch: 10/20/2025
SNOs_Map_NOAA-21_LANDSAT-9_20251020.jpg

Download SNOs between NOAA-21 and LANDSAT-9 since TLE EPOCH: 10/20/2025 in txt file.

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