Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 9 9.  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)
 09/11/2023   16:07:47   ( -69.94, 114.21) 09/11/2023   16:08:34  ( -69.96, 114.14)    3.11                47
 09/11/2023   16:58:31   (  69.87, -78.37) 09/11/2023   16:58:00  (  69.85, -78.36)    1.62                31
 09/14/2023   07:34:15   (  70.82,  61.27) 09/14/2023   07:35:22  (  70.68,  63.44)   80.98                67
 09/14/2023   08:24:42   ( -69.95,-130.03) 09/14/2023   08:25:03  ( -69.97,-129.97)    3.05                21
 09/14/2023   09:15:26   (  69.82,  37.46) 09/14/2023   09:14:31  (  69.80,  37.45)    2.46                55
 09/16/2023   23:50:55   (  70.00, 178.34) 09/16/2023   23:52:04  (  70.00, 178.33)    0.62                69
 09/17/2023   00:41:37   ( -69.91, -14.21) 09/17/2023   00:41:34  ( -69.89, -14.19)    2.31                 3
 09/17/2023   01:32:16   (  69.53, 153.67) 09/17/2023   01:31:04  (  69.62, 153.08)   25.06                72
 09/19/2023   16:07:50   (  69.97, -65.85) 09/19/2023   16:08:34  (  69.95, -65.85)    2.33                44
 09/19/2023   16:58:31   ( -69.83, 101.68) 09/19/2023   16:58:04  ( -69.85, 101.64)    2.64                27
 09/22/2023   07:34:16   ( -70.86,-118.79) 09/22/2023   07:35:23  ( -70.76,-116.43)   87.10                67
 09/22/2023   08:24:44   (  69.96,  49.94) 09/22/2023   08:25:02  (  69.94,  50.01)    3.48                18
 09/22/2023   09:15:25   ( -69.81,-142.53) 09/22/2023   09:14:32  ( -69.84,-142.50)    3.05                53