Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 9 27.  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)
 09/27/2023   16:07:48   ( -69.97, 114.15) 09/27/2023   16:08:30  ( -69.94, 114.15)    3.37                42
 09/27/2023   16:58:32   (  69.84, -78.35) 09/27/2023   16:57:57  (  69.83, -78.36)    0.97                35
 09/30/2023   07:34:09   (  70.55,  61.71) 09/30/2023   07:35:18  (  70.43,  63.11)   53.99                69
 09/30/2023   08:24:41   ( -69.94,-130.03) 09/30/2023   08:24:55  ( -69.93,-129.97)    2.53                14
 09/30/2023   09:15:25   (  69.81,  37.46) 09/30/2023   09:14:22  (  69.82,  37.53)    2.61                63
 10/02/2023   23:50:53   (  70.00, 178.32) 10/02/2023   23:51:51  (  69.99, 178.39)    2.86                58
 10/03/2023   00:41:34   ( -69.87, -14.15) 10/03/2023   00:41:21  ( -69.88, -14.13)    2.04                13
 10/03/2023   01:32:07   (  69.16, 154.17) 10/03/2023   01:30:58  (  69.22, 152.61)   62.06                69
 10/05/2023   16:07:46   (  69.95, -65.82) 10/05/2023   16:08:16  (  69.95, -65.77)    2.24                30
 10/05/2023   16:58:27   ( -69.81, 101.71) 10/05/2023   16:57:47  ( -69.79, 101.65)    2.92                40
 10/08/2023   07:34:00   ( -70.28,-117.87) 10/08/2023   07:35:11  ( -70.16,-117.21)   28.21                71
 10/08/2023   08:24:38   (  69.86,  50.09) 10/08/2023   08:24:41  (  69.87,  50.03)    2.99                 3
 10/08/2023   09:15:20   ( -69.76,-142.45) 10/08/2023   09:14:11  ( -69.77,-142.48)    1.35                69
 10/10/2023   23:50:46   ( -69.94,  -1.56) 10/10/2023   23:51:37  ( -69.93,  -1.63)    2.62                51
 10/11/2023   00:41:30   (  69.83, 165.91) 10/11/2023   00:41:04  (  69.81, 165.85)    3.40                26