Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 9 25.  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   16:07:47   ( -69.96, 114.17) 09/27/2023   16:08:29  ( -69.94, 114.15)    2.56                42
 09/27/2023   16:58:31   (  69.83, -78.34) 09/27/2023   16:57:56  (  69.83, -78.36)    0.92                35
 09/30/2023   07:34:09   (  70.54,  61.71) 09/30/2023   07:35:18  (  70.41,  63.09)   53.29                69
 09/30/2023   08:24:41   ( -69.93,-130.02) 09/30/2023   08:24:55  ( -69.92,-129.98)    1.97                14
 09/30/2023   09:15:25   (  69.81,  37.47) 09/30/2023   09:14:22  (  69.81,  37.51)    1.45                63
 10/02/2023   23:50:52   (  69.95, 178.41) 10/02/2023   23:51:51  (  69.96, 178.34)    2.67                59
 10/03/2023   00:41:34   ( -69.86, -14.14) 10/03/2023   00:41:21  ( -69.85, -14.17)    1.50                13
 10/03/2023   01:32:07   (  69.16, 154.18) 10/03/2023   01:30:58  (  69.18, 152.57)   63.65                69
 10/05/2023   16:07:46   (  69.95, -65.82) 10/05/2023   16:08:15  (  69.95, -65.76)    2.41                29
 10/05/2023   16:58:27   ( -69.81, 101.71) 10/05/2023   16:57:46  ( -69.79, 101.65)    2.58                41
 10/08/2023   07:33:59   ( -70.23,-117.78) 10/08/2023   07:35:10  ( -70.13,-117.24)   23.11                71
 10/08/2023   08:24:38   (  69.91,  50.01) 10/08/2023   08:24:38  (  69.90,  50.08)    2.78                 0
 10/08/2023   09:15:19   ( -69.76,-142.45) 10/08/2023   09:14:09  ( -69.75,-142.51)    2.87                70