Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 2 13.  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)
 02/15/2023   15:18:42   (  70.10, -53.37) 02/15/2023   15:19:27  (  70.10, -53.38)    0.30                45
 02/15/2023   16:09:24   ( -70.01, 114.08) 02/15/2023   16:08:57  ( -69.99, 114.09)    2.78                27
 02/18/2023   06:45:06   ( -70.88,-106.16) 02/18/2023   06:46:14  ( -70.80,-104.11)   75.33                68
 02/18/2023   07:35:36   (  70.03,  62.50) 02/18/2023   07:35:53  (  70.03,  62.42)    3.02                17
 02/18/2023   08:26:18   ( -69.94,-130.04) 02/18/2023   08:25:23  ( -69.92,-130.11)    2.84                55
 02/20/2023   23:01:48   ( -70.13,  10.80) 02/20/2023   23:02:51  ( -70.13,  10.81)    0.75                63
 02/20/2023   23:52:32   (  70.02, 178.28) 02/20/2023   23:52:18  (  70.02, 178.29)    0.79                14
 02/21/2023   00:43:06   ( -69.50, -13.64) 02/21/2023   00:41:55  ( -69.53, -14.76)   43.64                71
 02/23/2023   15:18:43   ( -70.06, 126.66) 02/23/2023   15:19:16  ( -70.07, 126.61)    2.22                33
 02/23/2023   16:09:27   (  69.95, -65.87) 02/23/2023   16:08:43  (  69.95, -65.91)    1.66                44
 02/26/2023   06:44:58   (  70.20,  74.88) 02/26/2023   06:46:09  (  70.16,  75.01)    7.06                71
 02/26/2023   07:35:39   ( -70.05,-117.56) 02/26/2023   07:35:39  ( -70.05,-117.51)    1.87                 0
 02/26/2023   08:26:20   (  69.78,  50.14) 02/26/2023   08:25:08  (  69.82,  49.82)   13.24                72