Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 8 10.  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)
 08/10/2023   16:07:42   ( -69.97, 114.24) 08/10/2023   16:08:16  ( -69.97, 114.18)    2.25                34
 08/10/2023   16:58:26   (  69.85, -78.28) 08/10/2023   16:57:43  (  69.87, -78.31)    2.04                43
 08/13/2023   07:34:00   (  70.50,  61.87) 08/13/2023   07:35:10  (  70.37,  63.01)   45.02                70
 08/13/2023   08:24:33   ( -69.94,-129.94) 08/13/2023   08:24:46  ( -69.92,-130.00)    2.94                13
 08/13/2023   09:15:17   (  69.83,  37.54) 08/13/2023   09:14:13  (  69.82,  37.51)    1.27                64
 08/15/2023   23:50:41   (  70.01, 178.42) 08/15/2023   23:51:44  (  70.02, 178.40)    1.41                63
 08/16/2023   00:41:23   ( -69.92, -14.12) 08/16/2023   00:41:14  ( -69.91, -14.13)    1.26                 9
 08/16/2023   01:31:58   (  69.33, 154.04) 08/16/2023   01:30:48  (  69.42, 152.84)   47.88                70
 08/18/2023   16:07:32   (  70.00, -65.78) 08/18/2023   16:08:13  (  69.98, -65.78)    2.85                41
 08/18/2023   16:58:13   ( -69.86, 101.76) 08/18/2023   16:57:43  ( -69.87, 101.70)    2.46                30
 08/21/2023   07:33:54   ( -70.89,-118.72) 08/21/2023   07:35:01  ( -70.78,-116.35)   87.32                67
 08/21/2023   08:24:22   (  69.95,  50.08) 08/21/2023   08:24:41  (  69.96,  50.09)    1.44                19
 08/21/2023   09:15:04   ( -69.85,-142.46) 08/21/2023   09:14:11  ( -69.86,-142.42)    1.29                53
 08/23/2023   23:50:30   ( -70.11,  -1.69) 08/23/2023   23:51:41  ( -70.09,  -1.48)    8.16                71
 08/24/2023   00:41:12   (  69.90, 165.94) 08/24/2023   00:41:09  (  69.92, 165.93)    1.89                 3
 08/24/2023   01:31:53   ( -69.75, -26.52) 08/24/2023   01:30:40  ( -69.76, -26.66)    5.41                73