Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 9 28.  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)
 09/30/2023   07:34:10   (  70.55,  61.70) 09/30/2023   07:35:19  (  70.42,  63.11)   54.22                69
 09/30/2023   08:24:42   ( -69.94,-130.04) 09/30/2023   08:24:56  ( -69.93,-129.97)    2.94                14
 09/30/2023   09:15:25   (  69.82,  37.46) 09/30/2023   09:14:22  (  69.82,  37.52)    2.53                63
 10/02/2023   23:50:53   (  70.01, 178.32) 10/02/2023   23:51:51  (  69.99, 178.39)    2.92                58
 10/03/2023   00:41:34   ( -69.87, -14.15) 10/03/2023   00:41:21  ( -69.88, -14.13)    1.97                13
 10/03/2023   01:32:07   (  69.16, 154.17) 10/03/2023   01:30:58  (  69.22, 152.61)   61.93                69
 10/05/2023   16:07:46   (  69.95, -65.82) 10/05/2023   16:08:16  (  69.96, -65.76)    2.87                30
 10/05/2023   16:58:27   ( -69.81, 101.71) 10/05/2023   16:57:47  ( -69.80, 101.65)    2.26                40
 10/08/2023   07:34:00   ( -70.28,-117.86) 10/08/2023   07:35:11  ( -70.17,-117.19)   27.51                71
 10/08/2023   08:24:39   (  69.90,  50.02) 10/08/2023   08:24:41  (  69.89,  50.05)    1.81                 2
 10/08/2023   09:15:20   ( -69.76,-142.44) 10/08/2023   09:14:11  ( -69.79,-142.46)    3.28                69
 10/10/2023   23:50:48   ( -69.98,  -1.62) 10/10/2023   23:51:38  ( -69.96,  -1.59)    2.46                50
 10/11/2023   00:41:31   (  69.82, 165.93) 10/11/2023   00:41:05  (  69.83, 165.88)    2.60                26