Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 8 5.  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)
 08/05/2023   07:34:02   ( -70.13,-117.57) 08/05/2023   07:35:14  ( -70.11,-117.38)    7.67                72
 08/05/2023   08:24:45   (  69.96,  49.99) 08/05/2023   08:24:42  (  69.96,  50.06)    2.66                 3
 08/05/2023   09:15:26   ( -69.82,-142.48) 08/05/2023   09:14:12  ( -69.84,-142.48)    2.14                74
 08/07/2023   23:50:52   ( -70.03,  -1.64) 08/07/2023   23:51:46  ( -70.01,  -1.64)    2.07                54
 08/08/2023   00:41:36   (  69.92, 165.83) 08/08/2023   00:41:13  (  69.91, 165.87)    1.57                23
 08/08/2023   01:32:03   ( -69.03, -25.57) 08/08/2023   01:30:55  ( -69.14, -27.54)   79.02                68
 08/10/2023   16:07:43   ( -69.99, 114.20) 08/10/2023   16:08:16  ( -70.00, 114.22)    1.02                33
 08/10/2023   16:58:27   (  69.89, -78.33) 08/10/2023   16:57:43  (  69.89, -78.27)    2.36                44
 08/13/2023   07:33:59   (  70.48,  61.90) 08/13/2023   07:35:09  (  70.39,  63.04)   43.64                70
 08/13/2023   08:24:33   ( -69.97,-129.98) 08/13/2023   08:24:45  ( -69.95,-129.96)    1.78                12
 08/13/2023   09:15:17   (  69.86,  37.49) 08/13/2023   09:14:12  (  69.84,  37.54)    2.53                65
 08/15/2023   23:50:42   (  70.04, 178.37) 08/15/2023   23:51:44  (  70.04, 178.42)    1.91                62
 08/16/2023   00:41:24   ( -69.94, -14.16) 08/16/2023   00:41:14  ( -69.93, -14.10)    2.97                10
 08/16/2023   01:31:59   (  69.36, 154.00) 08/16/2023   01:30:48  (  69.43, 152.87)   44.86                71
 08/18/2023   16:07:32   (  69.98, -65.75) 08/18/2023   16:08:13  (  69.99, -65.76)    0.99                41
 08/18/2023   16:58:14   ( -69.88, 101.72) 08/18/2023   16:57:43  ( -69.88, 101.73)    0.43                31