Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 2 18.  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)
 02/18/2023   06:45:06   ( -70.92,-106.22) 02/18/2023   06:46:14  ( -70.81,-104.09)   78.53                68
 02/18/2023   07:35:36   (  70.06,  62.45) 02/18/2023   07:35:53  (  70.06,  62.45)    0.79                17
 02/18/2023   08:26:17   ( -69.92,-130.02) 02/18/2023   08:25:23  ( -69.94,-130.09)    2.97                54
 02/20/2023   23:01:47   ( -70.15,  10.78) 02/20/2023   23:02:52  ( -70.12,  10.78)    2.74                65
 02/20/2023   23:52:31   (  70.03, 178.26) 02/20/2023   23:52:19  (  70.02, 178.28)    1.85                12
 02/21/2023   00:43:06   ( -69.57, -13.74) 02/21/2023   00:41:54  ( -69.63, -14.63)   34.90                72
 02/23/2023   15:18:41   ( -70.07, 126.65) 02/23/2023   15:19:17  ( -70.10, 126.64)    2.70                36
 02/23/2023   16:09:25   (  69.96, -65.87) 02/23/2023   16:08:44  (  69.99, -65.87)    2.91                41
 02/26/2023   06:44:58   (  70.37,  74.64) 02/26/2023   06:46:09  (  70.30,  75.20)   22.62                71
 02/26/2023   07:35:35   ( -70.01,-117.49) 02/26/2023   07:35:42  ( -70.02,-117.56)    3.07                 7
 02/26/2023   08:26:19   (  69.90,  49.98) 02/26/2023   08:25:09  (  69.91,  49.93)    2.34                70
 02/28/2023   23:01:47   (  70.12,-169.20) 02/28/2023   23:02:34  (  70.13,-169.15)    2.42                47
 02/28/2023   23:52:29   ( -70.02,  -1.73) 02/28/2023   23:52:04  ( -70.02,  -1.67)    2.59                25
 03/03/2023   14:28:11   ( -70.92, 137.97) 03/03/2023   14:29:18  ( -70.85, 140.18)   80.98                67
 03/03/2023   15:18:41   (  70.09, -53.39) 03/03/2023   15:18:57  (  70.07, -53.32)    3.23                16
 03/03/2023   16:09:22   ( -69.93, 114.16) 03/03/2023   16:08:28  ( -69.91, 114.09)    3.34                54