Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 9 12.  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)
 09/14/2023   07:34:14   (  70.77,  61.35) 09/14/2023   07:35:22  (  70.67,  63.43)   77.02                68
 09/14/2023   08:24:42   ( -69.96,-130.04) 09/14/2023   08:25:03  ( -69.95,-129.98)    2.35                21
 09/14/2023   09:15:26   (  69.83,  37.46) 09/14/2023   09:14:30  (  69.85,  37.52)    3.33                56
 09/16/2023   23:50:55   (  70.00, 178.34) 09/16/2023   23:52:04  (  69.98, 178.31)    2.44                69
 09/17/2023   00:41:36   ( -69.87, -14.14) 09/17/2023   00:41:34  ( -69.87, -14.21)    2.89                 2
 09/17/2023   01:32:16   (  69.53, 153.66) 09/17/2023   01:31:04  (  69.60, 153.06)   24.91                72
 09/19/2023   16:07:50   (  69.97, -65.85) 09/19/2023   16:08:33  (  69.98, -65.81)    1.64                43
 09/19/2023   16:58:31   ( -69.84, 101.67) 09/19/2023   16:58:04  ( -69.82, 101.60)    3.41                27
 09/22/2023   07:34:16   ( -70.86,-118.80) 09/22/2023   07:35:23  ( -70.72,-116.49)   85.71                67
 09/22/2023   08:24:44   (  69.90,  50.02) 09/22/2023   08:25:03  (  69.89,  49.95)    2.96                19
 09/22/2023   09:15:26   ( -69.81,-142.53) 09/22/2023   09:14:33  ( -69.79,-142.56)    2.94                53
 09/24/2023   23:50:54   ( -70.01,  -1.68) 09/24/2023   23:52:03  ( -70.00,  -1.65)    1.08                69
 09/25/2023   00:41:38   (  69.89, 165.80) 09/25/2023   00:41:30  (  69.88, 165.83)    1.35                 8
 09/25/2023   01:32:16   ( -69.59, -26.43) 09/25/2023   01:31:03  ( -69.62, -26.90)   18.56                73