Simultaneous Nadir Overpasses (SNOs) Predictions

Prediction of SNOs between NOAA-21 and TERRA Satellite Orbit:

Table of predicted SNOs for the next 14.0 days since TLE Epoch: 10/30/2025
Index Date (NOAA-21) Time (NOAA-21) Lat,Lon (NOAA-21) SZA (NOAA-21 ) Date (TERRA) Time (TERRA) Lat,Lon (TERRA) SZA (TERRA ) Distance(km) Time Diff (sec)
1 10/31/2025 23:54:01 -74.94, -11.82 90.53 10/31/2025 23:55:10 -74.85, -10.14 90.69 49.95 69
2 11/01/2025 00:44:38 74.50, 156.70 89.00 11/01/2025 00:44:35 74.51, 156.74 89.02 2.31 3
3 11/01/2025 01:35:12 -74.03, -34.79 91.49 11/01/2025 01:34:03 -74.06, -36.62 91.39 56.12 69
4 11/03/2025 10:15:31 74.59, 13.74 89.86 11/03/2025 10:16:36 74.58, 13.83 89.84 2.90 65
5 11/03/2025 11:06:13 -74.51,-178.73 90.22 11/03/2025 11:05:57 -74.49,-178.71 90.24 2.02 16
6 11/05/2025 20:37:05 -74.55, 38.44 89.44 11/05/2025 20:37:57 -74.58, 38.45 89.42 3.11 52
7 11/05/2025 21:27:50 74.51,-154.12 90.52 11/05/2025 21:27:17 74.50,-154.06 90.52 1.77 33
8 11/08/2025 06:58:41 74.56, 63.02 91.29 11/08/2025 06:59:16 74.57, 63.03 91.29 0.69 35
9 11/08/2025 07:49:23 -74.47,-129.42 88.80 11/08/2025 07:48:37 -74.48,-129.51 88.79 2.69 46
10 11/10/2025 17:20:16 -74.58, 87.58 88.01 11/10/2025 17:20:36 -74.57, 87.65 88.02 2.13 20
11 11/10/2025 18:11:00 74.49,-104.88 91.92 11/10/2025 18:09:56 74.49,-104.87 91.92 0.71 64
12 11/13/2025 02:51:20 -75.21, -56.92 86.65 11/13/2025 02:52:26 -75.09, -54.12 86.89 81.04 66
13 11/13/2025 03:41:52 74.56, 112.22 92.64 11/13/2025 03:41:55 74.55, 112.22 92.63 1.69 3

Figure of NOAA-21 and TERRA satellite orbits during SNOs since TLE Epoch: 10/30/2025
SNOs_Map_NOAA-21_TERRA_20251031.jpg

Download SNOs between NOAA-21 and TERRA since TLE EPOCH: 10/30/2025 in txt file.

Historial Predications of SNOs between NOAA-21 and TERRA