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: 10/14/2025
| 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 | 10/15/2025 | 23:02:08 | 70.07,-169.19 | 78.85 | 10/15/2025 | 23:02:54 | 70.07,-169.23 | 78.84 | 1.87 | 46 |
| 2 | 10/15/2025 | 23:52:49 | -69.97, -1.71 | 101.25 | 10/15/2025 | 23:52:24 | -69.96, -1.76 | 101.26 | 2.27 | 25 |
| 3 | 10/18/2025 | 15:18:59 | 70.06, -53.38 | 79.81 | 10/18/2025 | 15:19:23 | 70.07, -53.35 | 79.82 | 1.55 | 24 |
| 4 | 10/18/2025 | 16:09:40 | -69.95, 114.11 | 100.29 | 10/18/2025 | 16:08:53 | -69.96, 114.13 | 100.28 | 1.47 | 47 |
| 5 | 10/21/2025 | 06:45:10 | -70.46,-105.52 | 98.84 | 10/21/2025 | 06:46:21 | -70.32,-104.76 | 98.99 | 32.49 | 71 |
| 6 | 10/21/2025 | 07:35:49 | 70.06, 62.42 | 80.77 | 10/21/2025 | 07:35:51 | 70.04, 62.49 | 80.75 | 3.25 | 2 |
| 7 | 10/21/2025 | 08:26:30 | -69.95,-130.09 | 99.33 | 10/21/2025 | 08:25:21 | -69.94,-130.02 | 99.34 | 2.87 | 69 |
| 8 | 10/23/2025 | 23:01:54 | -70.09, 10.85 | 98.27 | 10/23/2025 | 23:02:53 | -70.10, 10.81 | 98.27 | 1.40 | 59 |
| 9 | 10/23/2025 | 23:52:39 | 70.01, 178.28 | 81.66 | 10/23/2025 | 23:52:20 | 69.98, 178.30 | 81.64 | 2.88 | 19 |
| 10 | 10/24/2025 | 00:43:09 | -69.31, -13.37 | 99.02 | 10/24/2025 | 00:41:59 | -69.39, -14.89 | 98.96 | 59.91 | 70 |
| 11 | 10/26/2025 | 15:18:44 | -70.05, 126.71 | 97.39 | 10/26/2025 | 15:19:21 | -70.07, 126.66 | 97.38 | 2.59 | 37 |
| 12 | 10/26/2025 | 16:09:29 | 69.97, -65.87 | 82.55 | 10/26/2025 | 16:08:48 | 69.95, -65.86 | 82.52 | 2.36 | 41 |
Figure of NOAA-21 and LANDSAT-9 satellite orbits during SNOs since TLE Epoch: 10/14/2025
Download SNOs between NOAA-21 and LANDSAT-9 since TLE EPOCH: 10/14/2025 in txt file.
Historial Predications of SNOs between NOAA-21 and LANDSAT-9