Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 10 21.  Predictions up to the next  14.0 days:

     Date     Time(NOAA-21) NOAA-21 Lat/Lon Date Time(LANDSAT-9) LANDSAT-9 Lat/Lon    Distance(km)  Time Diff(sec)
 10/21/2023   16:07:42   (  69.98, -65.86) 10/21/2023   16:08:43  (  69.98, -65.84)    0.55                61
 10/21/2023   16:58:24   ( -69.89, 101.59) 10/21/2023   16:58:13  ( -69.86, 101.63)    3.06                11
 10/21/2023   17:48:58   (  69.23, -90.15) 10/21/2023   17:47:48  (  69.32, -91.46)   52.73                70
 10/24/2023   08:24:41   (  69.91,  49.99) 10/24/2023   08:25:12  (  69.94,  49.99)    2.98                31
 10/24/2023   09:15:23   ( -69.82,-142.56) 10/24/2023   09:14:42  ( -69.83,-142.53)    1.30                41
 10/26/2023   23:51:00   ( -70.18,  -1.98) 10/26/2023   23:52:11  ( -70.13,  -1.49)   19.37                71
 10/27/2023   00:41:40   (  69.86, 165.82) 10/27/2023   00:41:41  (  69.86, 165.77)    2.01                 1
 10/27/2023   01:32:22   ( -69.76, -26.72) 10/27/2023   01:31:11  ( -69.75, -26.75)    1.43                71
 10/29/2023   16:07:55   ( -69.97, 114.08) 10/29/2023   16:08:40  ( -69.96, 114.16)    3.19                45
 10/29/2023   16:58:38   (  69.81, -78.36) 10/29/2023   16:58:08  (  69.80, -78.43)    2.92                30
 11/01/2023   07:34:21   (  70.52,  61.67) 11/01/2023   07:35:30  (  70.41,  63.06)   52.88                69
 11/01/2023   08:24:53   ( -69.88,-130.03) 11/01/2023   08:25:08  ( -69.86,-130.09)    2.95                15
 11/01/2023   09:15:37   (  69.77,  37.44) 11/01/2023   09:14:35  (  69.75,  37.40)    3.26                62
 11/03/2023   23:51:10   (  69.96, 178.29) 11/03/2023   23:52:04  (  69.94, 178.28)    2.57                54
 11/04/2023   00:41:52   ( -69.85, -14.23) 11/04/2023   00:41:34  ( -69.83, -14.23)    2.02                18
 11/04/2023   01:32:21   (  68.95, 154.37) 11/04/2023   01:31:14  (  69.00, 152.30)   82.65                67