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,-169.18) 04/01/2023   23:02:28  (  70.11,-169.22)    1.78                66
 04/01/2023   23:52:04   ( -70.03,  -1.73) 04/01/2023   23:51:58  ( -70.00,  -1.75)    3.25                 6
 04/02/2023   00:42:41   (  69.54, 166.30) 04/02/2023   00:41:30  (  69.62, 165.37)   37.15                71
 04/04/2023   15:18:13   (  70.10, -53.37) 04/04/2023   15:18:57  (  70.10, -53.36)    0.47                44
 04/04/2023   16:08:55   ( -70.01, 114.08) 04/04/2023   16:08:27  ( -69.99, 114.11)    2.62                28
 04/07/2023   07:35:03   (  70.05,  62.49) 04/07/2023   07:35:26  (  70.05,  62.44)    2.03                23
 04/07/2023   08:25:44   ( -69.96,-130.06) 04/07/2023   08:24:55  ( -69.94,-130.08)    2.17                49
 04/09/2023   23:01:12   ( -70.32,  10.54) 04/09/2023   23:02:23  ( -70.28,  11.01)   18.32                71
 04/09/2023   23:51:52   (  70.01, 178.33) 04/09/2023   23:51:53  (  70.00, 178.26)    2.89                 1
 04/10/2023   00:42:34   ( -69.91, -14.21) 04/10/2023   00:41:23  ( -69.90, -14.26)    2.64                71
 04/12/2023   15:17:58   ( -70.09, 126.69) 04/12/2023   15:18:53  ( -70.09, 126.61)    2.76                55
 04/12/2023   16:08:42   (  69.98, -65.85) 04/12/2023   16:08:20  (  69.97, -65.90)    2.50                22
 04/12/2023   16:59:10   ( -69.15, 102.68) 04/12/2023   16:58:02  ( -69.21, 100.70)   78.84                68
 04/15/2023   07:34:48   ( -70.07,-117.51) 04/15/2023   07:35:19  ( -70.07,-117.52)    0.78                31
 04/15/2023   08:25:32   (  69.97,  49.95) 04/15/2023   08:24:46  (  69.95,  49.96)    2.38                46