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: 7/15/2025
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 07/17/2025 05:55:10 70.28, 87.25 49.14 07/17/2025 05:56:21 70.23, 87.53 49.07 12.14 71
2 07/17/2025 06:45:50 -70.09,-105.13 131.06 07/17/2025 06:45:52 -70.07,-105.06 131.08 2.94 2
3 07/17/2025 07:36:33 69.92, 62.44 48.77 07/17/2025 07:35:20 69.91, 62.35 48.77 3.25 73
4 07/19/2025 22:12:03 70.13,-156.75 49.46 07/19/2025 22:12:54 70.11,-156.77 49.43 2.58 51
5 07/19/2025 23:02:45 -70.03, 10.72 130.64 07/19/2025 23:02:24 -70.00, 10.72 130.66 2.86 21
6 07/19/2025 23:53:12 69.02, 179.50 48.31 07/19/2025 23:52:06 69.06, 177.10 48.46 95.70 66
7 07/22/2025 14:28:57 70.08, -40.91 49.94 07/22/2025 14:29:24 70.08, -40.93 49.93 1.09 27
8 07/22/2025 15:19:39 -69.98, 126.57 130.17 07/22/2025 15:18:54 -69.98, 126.56 130.16 0.29 45
9 07/25/2025 05:55:13 -70.40, -92.94 129.18 07/25/2025 05:56:25 -70.31, -92.35 129.30 23.77 72
10 07/25/2025 06:45:52 70.04, 74.92 50.46 07/25/2025 06:45:55 70.03, 74.89 50.45 1.66 3
11 07/25/2025 07:36:34 -69.93,-117.59 129.66 07/25/2025 07:35:25 -69.94,-117.62 129.64 1.29 69
12 07/27/2025 22:12:04 -70.14, 23.23 128.85 07/27/2025 22:12:58 -70.15, 23.29 128.85 2.47 54
13 07/27/2025 23:02:47 70.01,-169.25 51.02 07/27/2025 23:02:25 70.03,-169.24 51.04 2.91 22

Figure of NOAA-21 and LANDSAT-9 satellite orbits during SNOs since TLE Epoch: 7/15/2025
SNOs_Map_NOAA-21_LANDSAT-9_20250715.jpg

Download SNOs between NOAA-21 and LANDSAT-9 since TLE EPOCH: 07/15/2025 in txt file.

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