Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 8 30.  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)
 08/31/2023   23:50:50   (  69.98, 178.41) 08/31/2023   23:51:56  (  70.00, 178.34)    3.35                66
 09/01/2023   00:41:32   ( -69.90, -14.15) 09/01/2023   00:41:26  ( -69.88, -14.19)    2.28                 6
 09/01/2023   01:32:09   (  69.40, 153.89) 09/01/2023   01:30:58  (  69.50, 152.94)   38.92                71
 09/03/2023   16:07:45   (  69.95, -65.79) 09/03/2023   16:08:25  (  69.99, -65.79)    3.43                40
 09/03/2023   16:58:27   ( -69.87, 101.66) 09/03/2023   16:57:55  ( -69.88, 101.69)    1.35                32
 09/06/2023   07:34:10   ( -70.74,-118.57) 09/06/2023   07:35:18  ( -70.61,-116.65)   72.09                68
 09/06/2023   08:24:41   (  69.94,  50.00) 09/06/2023   08:24:55  (  69.95,  50.04)    2.28                14
 09/06/2023   09:15:22   ( -69.80,-142.47) 09/06/2023   09:14:26  ( -69.79,-142.55)    2.93                56
 09/08/2023   23:50:52   ( -69.99,  -1.63) 09/08/2023   23:51:58  ( -70.01,  -1.64)    1.90                66
 09/09/2023   00:41:36   (  69.87, 165.86) 09/09/2023   00:41:25  (  69.90, 165.85)    2.48                11
 09/09/2023   01:32:12   ( -69.47, -26.23) 09/09/2023   01:31:00  ( -69.52, -27.04)   32.02                72
 09/11/2023   16:07:48   ( -69.99, 114.15) 09/11/2023   16:08:27  ( -69.99, 114.22)    2.68                39
 09/11/2023   16:58:32   (  69.87, -78.37) 09/11/2023   16:57:54  (  69.87, -78.30)    2.64                38