Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 5 24.  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)
 05/25/2023   06:44:11   ( -70.93,-106.23) 05/25/2023   06:45:18  ( -70.81,-104.09)   78.97                67
 05/25/2023   07:34:40   (  70.07,  62.45) 05/25/2023   07:34:56  (  70.06,  62.44)    1.52                16
 05/25/2023   08:25:21   ( -69.94,-130.03) 05/25/2023   08:24:26  ( -69.94,-130.09)    2.25                55
 05/27/2023   23:00:50   ( -70.11,  10.84) 05/27/2023   23:01:55  ( -70.13,  10.78)    3.01                65
 05/27/2023   23:51:35   (  70.04, 178.26) 05/27/2023   23:51:22  (  70.02, 178.28)    2.22                13
 05/28/2023   00:42:09   ( -69.54, -13.67) 05/28/2023   00:40:58  ( -69.58, -14.70)   40.16                71
 05/30/2023   15:17:45   ( -70.09, 126.65) 05/30/2023   15:18:21  ( -70.07, 126.59)    2.66                36
 05/30/2023   16:08:29   (  69.97, -65.87) 05/30/2023   16:07:48  (  69.96, -65.92)    2.13                41
 06/02/2023   06:44:02   (  70.37,  74.65) 06/02/2023   06:45:13  (  70.32,  75.20)   21.32                71
 06/02/2023   07:34:40   ( -70.07,-117.56) 06/02/2023   07:34:46  ( -70.04,-117.56)    2.93                 6
 06/02/2023   08:25:24   (  69.96,  49.92) 06/02/2023   08:24:13  (  69.93,  49.93)    2.83                71
 06/04/2023   23:00:52   (  70.10,-169.16) 06/04/2023   23:01:41  (  70.09,-169.23)    2.77                49
 06/04/2023   23:51:33   ( -70.01,  -1.70) 06/04/2023   23:51:10  ( -69.99,  -1.75)    2.89                23