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: 9/20/2025
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 09/21/2025 22:12:01 70.69,-157.58 70.28 09/21/2025 22:13:10 70.59,-156.09 70.16 55.85 69
2 09/21/2025 23:02:32 -70.03, 10.77 110.38 09/21/2025 23:02:48 -70.03, 10.73 110.38 1.47 16
3 09/21/2025 23:53:17 69.96, 178.19 69.56 09/21/2025 23:52:15 69.94, 178.24 69.54 2.92 62
4 09/24/2025 14:28:44 70.14, -40.94 70.76 09/24/2025 14:29:49 70.12, -40.90 70.73 2.98 65
5 09/24/2025 15:19:25 -70.02, 126.57 109.36 09/24/2025 15:19:19 -70.01, 126.57 109.37 0.79 6
6 09/24/2025 16:10:03 69.57, -65.45 70.20 09/24/2025 16:08:51 69.63, -66.31 70.27 33.75 72
7 09/27/2025 06:45:36 70.08, 74.94 71.74 09/27/2025 06:46:20 70.06, 74.90 71.72 2.27 44
8 09/27/2025 07:36:17 -69.95,-117.55 108.38 09/27/2025 07:35:50 -69.96,-117.62 108.38 2.64 27
9 09/29/2025 22:12:01 -71.09, 21.77 106.21 09/29/2025 22:13:07 -70.97, 24.48 106.36 98.77 66
10 09/29/2025 23:02:27 70.02,-169.20 72.72 09/29/2025 23:02:49 70.04,-169.26 72.73 2.89 22
11 09/29/2025 23:53:09 -69.95, -1.77 107.35 09/29/2025 23:52:19 -69.93, -1.77 107.36 1.83 50
12 10/02/2025 14:28:38 -70.26, 138.91 106.02 10/02/2025 14:29:50 -70.21, 139.22 106.08 13.01 72
13 10/02/2025 15:19:20 70.03, -53.42 73.76 10/02/2025 15:19:18 70.04, -53.37 73.77 2.66 2
14 10/02/2025 16:10:01 -69.90, 114.09 106.36 10/02/2025 16:08:49 -69.89, 114.04 106.37 2.46 72

Figure of NOAA-21 and LANDSAT-9 satellite orbits during SNOs since TLE Epoch: 9/20/2025
SNOs_Map_NOAA-21_LANDSAT-9_20250921.jpg

Download SNOs between NOAA-21 and LANDSAT-9 since TLE EPOCH: 09/20/2025 in txt file.

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