Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 9 5.  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)
 09/06/2023   07:34:11   ( -70.81,-118.68) 09/06/2023   07:35:18  ( -70.72,-116.49)   80.67                67
 09/06/2023   08:24:41   (  69.94,  49.99) 09/06/2023   08:24:57  (  69.97,  50.05)    3.30                16
 09/06/2023   09:15:22   ( -69.81,-142.50) 09/06/2023   09:14:28  ( -69.80,-142.55)    2.68                54
 09/08/2023   23:50:52   ( -70.01,  -1.65) 09/08/2023   23:52:02  ( -70.01,  -1.65)    0.30                70
 09/09/2023   00:41:36   (  69.88, 165.84) 09/09/2023   00:41:29  (  69.91, 165.85)    2.79                 7
 09/09/2023   01:32:14   ( -69.59, -26.41) 09/09/2023   01:31:01  ( -69.69, -26.82)   19.51                73
 09/11/2023   16:07:48   ( -70.01, 114.11) 09/11/2023   16:08:33  ( -69.99, 114.19)    3.62                45
 09/11/2023   16:58:31   (  69.83, -78.31) 09/11/2023   16:58:01  (  69.83, -78.39)    3.00                30
 09/14/2023   07:34:15   (  70.79,  61.33) 09/14/2023   07:35:22  (  70.70,  63.48)   79.41                67
 09/14/2023   08:24:43   ( -69.96,-130.05) 09/14/2023   08:25:04  ( -69.94,-129.99)    3.08                21
 09/14/2023   09:15:27   (  69.84,  37.44) 09/14/2023   09:14:31  (  69.83,  37.49)    2.53                56
 09/16/2023   23:50:55   (  70.01, 178.32) 09/16/2023   23:52:03  (  70.02, 178.37)    2.21                68
 09/17/2023   00:41:36   ( -69.87, -14.15) 09/17/2023   00:41:34  ( -69.87, -14.22)    2.52                 2
 09/17/2023   01:32:16   (  69.54, 153.64) 09/17/2023   01:31:04  (  69.59, 153.04)   23.90                72