Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 10 22.  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)
 10/24/2023   08:24:41   (  69.92,  49.98) 10/24/2023   08:25:12  (  69.94,  49.99)    2.08                31
 10/24/2023   09:15:23   ( -69.83,-142.57) 10/24/2023   09:14:42  ( -69.82,-142.54)    1.28                41
 10/26/2023   23:51:00   ( -70.19,  -2.00) 10/26/2023   23:52:11  ( -70.14,  -1.48)   20.49                71
 10/27/2023   00:41:40   (  69.87, 165.80) 10/27/2023   00:41:41  (  69.87, 165.78)    0.97                 1
 10/27/2023   01:32:22   ( -69.77, -26.74) 10/27/2023   01:31:11  ( -69.76, -26.74)    1.50                71
 10/29/2023   16:07:54   ( -69.94, 114.14) 10/29/2023   16:08:41  ( -69.93, 114.11)    1.68                47
 10/29/2023   16:58:38   (  69.83, -78.39) 10/29/2023   16:58:08  (  69.82, -78.40)    1.22                30
 11/01/2023   07:34:21   (  70.54,  61.64) 11/01/2023   07:35:30  (  70.44,  63.11)   55.52                69
 11/01/2023   08:24:53   ( -69.91,-130.06) 11/01/2023   08:25:08  ( -69.90,-130.04)    1.11                15
 11/01/2023   09:15:37   (  69.80,  37.41) 11/01/2023   09:14:35  (  69.78,  37.45)    2.02                62
 11/03/2023   23:51:09   (  69.94, 178.32) 11/03/2023   23:52:05  (  69.94, 178.28)    1.79                56
 11/04/2023   00:41:51   ( -69.83, -14.20) 11/04/2023   00:41:35  ( -69.83, -14.24)    1.45                16
 11/04/2023   01:32:22   (  69.03, 154.25) 11/04/2023   01:31:14  (  69.05, 152.37)   75.07                68