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: 9/10/2025
| 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 | 09/11/2025 | 06:45:46 | 70.07, 74.91 | 65.56 | 09/11/2025 | 06:46:16 | 70.05, 74.88 | 65.53 | 2.33 | 30 |
| 2 | 09/11/2025 | 07:36:28 | -69.98,-117.63 | 114.53 | 09/11/2025 | 07:35:45 | -69.99,-117.57 | 114.52 | 2.77 | 43 |
| 3 | 09/13/2025 | 22:12:03 | -70.56, 22.60 | 112.93 | 09/13/2025 | 22:13:13 | -70.44, 23.68 | 113.09 | 42.29 | 70 |
| 4 | 09/13/2025 | 23:02:39 | 70.03,-169.26 | 66.54 | 09/13/2025 | 23:02:46 | 70.01,-169.30 | 66.51 | 3.10 | 7 |
| 5 | 09/13/2025 | 23:53:21 | -69.94, -1.80 | 113.55 | 09/13/2025 | 23:52:15 | -69.95, -1.75 | 113.54 | 2.29 | 66 |
| 6 | 09/16/2025 | 14:28:47 | -70.11, 139.09 | 112.37 | 09/16/2025 | 14:29:47 | -70.10, 139.08 | 112.38 | 0.74 | 60 |
| 7 | 09/16/2025 | 15:19:31 | 70.00, -53.43 | 67.53 | 09/16/2025 | 15:19:14 | 70.00, -53.42 | 67.53 | 0.35 | 17 |
| 8 | 09/16/2025 | 16:10:03 | -69.38, 114.80 | 113.10 | 09/16/2025 | 16:08:53 | -69.39, 113.38 | 113.05 | 55.71 | 70 |
| 9 | 09/19/2025 | 06:45:40 | -70.08,-105.09 | 111.37 | 09/19/2025 | 06:46:16 | -70.08,-105.07 | 111.37 | 0.76 | 36 |
| 10 | 09/19/2025 | 07:36:24 | 69.97, 62.40 | 68.53 | 09/19/2025 | 07:35:43 | 69.97, 62.43 | 68.54 | 1.33 | 41 |
| 11 | 09/21/2025 | 22:11:59 | 70.57,-157.39 | 70.16 | 09/21/2025 | 22:13:09 | 70.48,-156.24 | 70.05 | 43.77 | 70 |
| 12 | 09/21/2025 | 23:02:33 | -70.06, 10.73 | 110.36 | 09/21/2025 | 23:02:45 | -70.04, 10.76 | 110.38 | 2.31 | 12 |
| 13 | 09/21/2025 | 23:53:17 | 69.94, 178.21 | 69.54 | 09/21/2025 | 23:52:12 | 69.93, 178.25 | 69.53 | 2.07 | 65 |
| 14 | 09/24/2025 | 14:28:44 | 70.13, -40.92 | 70.75 | 09/24/2025 | 14:29:43 | 70.14, -40.84 | 70.75 | 3.24 | 59 |
| 15 | 09/24/2025 | 15:19:25 | -69.99, 126.61 | 109.39 | 09/24/2025 | 15:19:14 | -69.98, 126.57 | 109.39 | 1.81 | 11 |
| 16 | 09/24/2025 | 16:09:59 | 69.34, -65.13 | 69.97 | 09/24/2025 | 16:08:50 | 69.37, -66.62 | 70.02 | 58.78 | 69 |
Figure of NOAA-21 and LANDSAT-9 satellite orbits during SNOs since TLE Epoch: 9/10/2025
Download SNOs between NOAA-21 and LANDSAT-9 since TLE EPOCH: 09/10/2025 in txt file.
Historial Predications of SNOs between NOAA-21 and LANDSAT-9