Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 3 11.  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)
 03/14/2023   06:44:55   (  70.53,  74.37) 03/14/2023   06:46:05  (  70.43,  75.35)   38.10                70
 03/14/2023   07:35:30   ( -70.07,-117.60) 03/14/2023   07:35:40  ( -70.05,-117.56)    2.11                10
 03/14/2023   08:26:14   (  69.95,  49.88) 03/14/2023   08:25:07  (  69.94,  49.93)    2.24                67
 03/16/2023   23:01:41   (  70.15,-169.27) 03/16/2023   23:02:39  (  70.14,-169.19)    3.33                58
 03/16/2023   23:52:22   ( -70.01,  -1.73) 03/16/2023   23:52:10  ( -69.98,  -1.78)    3.35                12
 03/17/2023   00:42:55   (  69.31, 166.59) 03/17/2023   00:41:46  (  69.37, 165.03)   61.68                69
 03/19/2023   15:18:32   (  70.06, -53.35) 03/19/2023   15:19:08  (  70.06, -53.42)    2.45                36
 03/19/2023   16:09:13   ( -69.96, 114.11) 03/19/2023   16:08:37  ( -69.96, 114.07)    1.33                36
 03/22/2023   06:44:50   ( -70.72,-105.92) 03/22/2023   06:45:59  ( -70.60,-104.40)   57.57                69
 03/22/2023   07:35:23   (  70.04,  62.46) 03/22/2023   07:35:34  (  70.04,  62.44)    1.04                11
 03/22/2023   08:26:05   ( -69.94,-130.08) 03/22/2023   08:25:04  ( -69.94,-130.07)    0.63                61
 03/24/2023   23:01:31   ( -70.13,  10.78) 03/24/2023   23:02:33  ( -70.14,  10.82)    1.78                62
 03/24/2023   23:52:15   (  70.03, 178.24) 03/24/2023   23:52:00  (  70.02, 178.29)    2.35                15
 03/25/2023   00:42:48   ( -69.45, -13.59) 03/25/2023   00:41:37  ( -69.53, -14.74)   45.72                71