Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 8 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)
 08/29/2023   07:34:06   (  70.66,  61.58) 08/29/2023   07:35:15  (  70.56,  63.28)   63.95                69
 08/29/2023   08:24:36   ( -69.95,-129.99) 08/29/2023   08:24:54  ( -69.96,-129.96)    1.17                18
 08/29/2023   09:15:20   (  69.82,  37.51) 08/29/2023   09:14:22  (  69.80,  37.47)    3.05                58
 08/31/2023   23:50:50   (  70.00, 178.38) 08/31/2023   23:51:55  (  70.03, 178.38)    2.85                65
 09/01/2023   00:41:32   ( -69.92, -14.17) 09/01/2023   00:41:25  ( -69.92, -14.14)    1.31                 7
 09/01/2023   01:32:09   (  69.42, 153.86) 09/01/2023   01:30:58  (  69.48, 152.91)   37.84                71
 09/03/2023   16:07:46   (  69.97, -65.82) 09/03/2023   16:08:26  (  69.96, -65.83)    2.17                40
 09/03/2023   16:58:27   ( -69.84, 101.71) 09/03/2023   16:57:56  ( -69.85, 101.65)    2.68                31
 09/06/2023   07:34:10   ( -70.71,-118.51) 09/06/2023   07:35:18  ( -70.63,-116.61)   70.35                68
 09/06/2023   08:24:40   (  69.90,  50.05) 09/06/2023   08:24:55  (  69.92,  50.00)    2.53                15
 09/06/2023   09:15:22   ( -69.82,-142.50) 09/06/2023   09:14:25  ( -69.82,-142.51)    0.54                57
 09/08/2023   23:50:52   ( -70.01,  -1.65) 09/08/2023   23:51:57  ( -70.03,  -1.61)    2.27                65
 09/09/2023   00:41:36   (  69.89, 165.83) 09/09/2023   00:41:24  (  69.91, 165.87)    2.30                12
 09/09/2023   01:32:11   ( -69.43, -26.18) 09/09/2023   01:31:00  ( -69.48, -27.09)   35.85                71