Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 4 1.  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)
 04/01/2023   23:01:22   (  70.11,-169.17) 04/01/2023   23:02:28  (  70.11,-169.22)    2.00                66
 04/01/2023   23:52:04   ( -70.02,  -1.72) 04/01/2023   23:51:58  ( -70.00,  -1.75)    2.71                 6
 04/02/2023   00:42:41   (  69.54, 166.31) 04/02/2023   00:41:30  (  69.62, 165.37)   37.41                71
 04/04/2023   15:18:13   (  70.10, -53.37) 04/04/2023   15:18:57  (  70.08, -53.39)    2.31                44
 04/04/2023   16:08:54   ( -69.95, 114.16) 04/04/2023   16:08:27  ( -69.97, 114.08)    3.34                27
 04/07/2023   06:44:36   ( -71.10,-106.51) 04/07/2023   06:45:42  ( -70.97,-103.84)   97.54                66
 04/07/2023   07:35:02   (  70.05,  62.49) 04/07/2023   07:35:24  (  70.04,  62.43)    2.30                22
 04/07/2023   08:25:44   ( -69.95,-130.05) 04/07/2023   08:24:54  ( -69.93,-130.09)    2.89                50
 04/09/2023   23:01:11   ( -70.27,  10.61) 04/09/2023   23:02:22  ( -70.22,  10.93)   13.32                71
 04/09/2023   23:51:52   (  70.01, 178.33) 04/09/2023   23:51:51  (  70.00, 178.26)    3.12                 1
 04/10/2023   00:42:34   ( -69.92, -14.21) 04/10/2023   00:41:20  ( -69.94, -14.18)    3.35                74
 04/12/2023   15:17:58   ( -70.09, 126.68) 04/12/2023   15:18:49  ( -70.12, 126.68)    3.06                51
 04/12/2023   16:08:42   (  69.99, -65.86) 04/12/2023   16:08:16  (  70.00, -65.84)    1.57                26