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: 10/11/2025
| 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 | 10/13/2025 | 06:45:17 | 70.09, 75.01 | 77.87 | 10/13/2025 | 06:46:24 | 70.11, 74.94 | 77.89 | 3.48 | 67 |
| 2 | 10/13/2025 | 07:35:58 | -69.98,-117.51 | 102.23 | 10/13/2025 | 07:35:54 | -70.00,-117.58 | 102.21 | 3.33 | 4 |
| 3 | 10/13/2025 | 08:26:37 | 69.57, 50.41 | 77.37 | 10/13/2025 | 08:25:26 | 69.62, 49.54 | 77.42 | 34.35 | 71 |
| 4 | 10/15/2025 | 23:02:09 | 70.11,-169.25 | 78.89 | 10/15/2025 | 23:02:54 | 70.09,-169.20 | 78.86 | 3.14 | 45 |
| 5 | 10/15/2025 | 23:52:50 | -70.01, -1.76 | 101.21 | 10/15/2025 | 23:52:24 | -69.98, -1.72 | 101.24 | 2.93 | 26 |
| 6 | 10/18/2025 | 15:18:59 | 70.05, -53.35 | 79.80 | 10/18/2025 | 15:19:24 | 70.05, -53.39 | 79.80 | 1.22 | 25 |
| 7 | 10/18/2025 | 16:09:39 | -69.94, 114.14 | 100.30 | 10/18/2025 | 16:08:53 | -69.94, 114.10 | 100.30 | 1.50 | 46 |
| 8 | 10/21/2025 | 06:45:10 | -70.44,-105.48 | 98.86 | 10/21/2025 | 06:46:21 | -70.36,-104.69 | 98.94 | 30.74 | 71 |
| 9 | 10/21/2025 | 07:35:49 | 70.04, 62.45 | 80.75 | 10/21/2025 | 07:35:52 | 70.03, 62.47 | 80.74 | 1.61 | 3 |
| 10 | 10/21/2025 | 08:26:30 | -69.93,-130.06 | 99.35 | 10/21/2025 | 08:25:22 | -69.93,-130.04 | 99.35 | 0.97 | 68 |
| 11 | 10/23/2025 | 23:01:55 | -70.12, 10.80 | 98.24 | 10/23/2025 | 23:02:54 | -70.10, 10.82 | 98.26 | 2.49 | 59 |
| 12 | 10/23/2025 | 23:52:39 | 69.99, 178.31 | 81.64 | 10/23/2025 | 23:52:21 | 69.98, 178.29 | 81.64 | 0.97 | 18 |
Figure of NOAA-21 and LANDSAT-9 satellite orbits during SNOs since TLE Epoch: 10/11/2025
Download SNOs between NOAA-21 and LANDSAT-9 since TLE EPOCH: 10/11/2025 in txt file.
Historial Predications of SNOs between NOAA-21 and LANDSAT-9