Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 12 30.  Predictions up to the next  14.0 days:

     Date     Time(NOAA-21) NOAA-21 Lat/Lon Date Time(LANDSAT-8) LANDSAT-8 Lat/Lon    Distance(km)  Time Diff(sec)
 12/31/2023   07:09:37   (  70.63,  67.67) 12/31/2023   07:10:46  (  70.51,  69.34)   63.06                69
 12/31/2023   08:00:07   ( -69.92,-123.89) 12/31/2023   08:00:25  ( -69.91,-123.90)    0.98                18
 12/31/2023   08:50:51   (  69.80,  43.60) 12/31/2023   08:49:52  (  69.80,  43.59)    0.63                59
 01/02/2024   23:26:19   (  69.98,-175.53) 01/02/2024   23:27:22  (  69.99,-175.53)    1.70                63
 01/03/2024   00:17:01   ( -69.89,  -8.08) 01/03/2024   00:16:52  ( -69.88,  -8.05)    1.36                 9
 01/03/2024   01:07:37   (  69.35, 160.02) 01/03/2024   01:06:26  (  69.39, 158.92)   43.54                71
 01/05/2024   15:43:12   (  69.96, -59.73) 01/05/2024   15:43:48  (  69.94, -59.72)    2.97                36
 01/05/2024   16:33:53   ( -69.82, 107.80) 01/05/2024   16:33:18  ( -69.83, 107.77)    1.59                35
 01/08/2024   07:09:30   ( -70.49,-112.08) 01/08/2024   07:10:40  ( -70.41,-110.80)   48.78                70
 01/08/2024   08:00:05   (  69.91,  56.14) 01/08/2024   08:00:14  (  69.91,  56.14)    0.26                 9
 01/08/2024   08:50:47   ( -69.82,-136.41) 01/08/2024   08:49:44  ( -69.80,-136.38)    1.88                63
 01/10/2024   23:26:14   ( -69.97,   4.51) 01/10/2024   23:27:13  ( -69.97,   4.47)    1.52                59
 01/11/2024   00:16:58   (  69.86, 171.99) 01/11/2024   00:16:40  (  69.85, 171.95)    1.60                18
 01/11/2024   01:07:29   ( -69.18, -19.72) 01/11/2024   01:06:19  ( -69.25, -21.22)   59.89                70