Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 3 20.  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)
 03/22/2023   06:44:50   ( -70.71,-105.92) 03/22/2023   06:45:59  ( -70.64,-104.34)   58.79                69
 03/22/2023   07:35:23   (  70.02,  62.47) 03/22/2023   07:35:35  (  70.05,  62.44)    2.80                12
 03/22/2023   08:26:05   ( -69.94,-130.08) 03/22/2023   08:25:05  ( -69.93,-130.09)    0.44                60
 03/24/2023   23:01:31   ( -70.11,  10.81) 03/24/2023   23:02:35  ( -70.14,  10.81)    3.33                64
 03/24/2023   23:52:15   (  70.00, 178.28) 03/24/2023   23:52:02  (  70.03, 178.30)    3.52                13
 03/25/2023   00:42:50   ( -69.54, -13.72) 03/25/2023   00:41:38  ( -69.59, -14.67)   37.60                72
 03/27/2023   15:18:23   ( -70.10, 126.61) 03/27/2023   15:19:02  ( -70.10, 126.63)    0.86                39
 03/27/2023   16:09:07   (  69.99, -65.92) 03/27/2023   16:08:29  (  69.98, -65.88)    1.54                38
 03/30/2023   06:44:42   (  70.66,  74.18) 03/30/2023   06:45:51  (  70.56,  75.56)   52.34                69
 03/30/2023   07:35:14   ( -70.04,-117.53) 03/30/2023   07:35:28  ( -70.07,-117.52)    3.56                14
 03/30/2023   08:25:58   (  69.93,  49.94) 03/30/2023   08:24:55  (  69.95,  49.97)    2.57                63
 04/01/2023   23:01:22   (  70.09,-169.14) 04/01/2023   23:02:23  (  70.11,-169.20)    3.27                61
 04/01/2023   23:52:04   ( -69.99,  -1.68) 04/01/2023   23:51:53  ( -70.01,  -1.71)    2.43                11
 04/02/2023   00:42:38   (  69.36, 166.56) 04/02/2023   00:41:29  (  69.39, 165.09)   57.62                69