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: 4/15/2025
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 04/17/2025 14:28:07 70.48, -41.25 59.73 04/17/2025 14:29:19 70.36, -40.66 59.58 25.70 72
2 04/17/2025 15:18:45 -70.15, 126.58 120.63 04/17/2025 15:18:51 -70.14, 126.66 120.65 3.06 6
3 04/17/2025 16:09:28 70.01, -65.90 59.22 04/17/2025 16:08:18 70.03, -65.85 59.24 2.74 70
4 04/20/2025 06:44:52 70.19, 74.98 58.50 04/20/2025 06:45:49 70.18, 74.97 58.48 2.09 57
5 04/20/2025 07:35:34 -70.07,-117.51 121.64 04/20/2025 07:35:19 -70.07,-117.56 121.65 1.77 15
6 04/20/2025 08:26:05 69.30, 50.93 57.56 04/20/2025 08:24:57 69.35, 49.11 57.65 71.62 68
7 04/22/2025 23:01:41 70.19,-169.21 57.59 04/22/2025 23:02:14 70.17,-169.16 57.56 3.06 33
8 04/22/2025 23:52:23 -70.06, -1.71 122.56 04/22/2025 23:51:44 -70.06, -1.68 122.56 1.32 39
9 04/25/2025 14:27:56 -70.74, 138.39 122.71 04/25/2025 14:29:06 -70.60, 139.73 122.89 51.33 70
10 04/25/2025 15:18:30 70.14, -53.35 56.66 04/25/2025 15:18:40 70.11, -53.35 56.62 3.55 10
11 04/25/2025 16:09:12 -70.02, 114.16 123.49 04/25/2025 16:08:10 -70.00, 114.13 123.50 1.86 62
12 04/28/2025 06:44:36 -70.23,-105.01 124.10 04/28/2025 06:45:37 -70.23,-104.93 124.11 2.77 61
13 04/28/2025 07:35:19 70.10, 62.50 55.76 04/28/2025 07:35:04 70.11, 62.54 55.77 1.86 15
14 04/28/2025 08:25:52 -69.50,-129.29 124.87 04/28/2025 08:24:42 -69.57,-130.58 124.77 50.32 70

Figure of NOAA-21 and LANDSAT-9 satellite orbits during SNOs since TLE Epoch: 4/15/2025
SNOs_Map_NOAA-21_LANDSAT-9_20250415.jpg

Download SNOs between NOAA-21 and LANDSAT-9 since TLE EPOCH: 04/15/2025 in txt file.

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