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   06:44:10   ( -70.93,-106.23) 05/25/2023   06:45:17  ( -70.82,-104.09)   78.90                67
 05/25/2023   07:34:40   (  70.07,  62.45) 05/25/2023   07:34:56  (  70.06,  62.44)    0.96                16
 05/25/2023   08:25:21   ( -69.94,-130.03) 05/25/2023   08:24:26  ( -69.94,-130.09)    2.32                55
 05/27/2023   23:00:50   ( -70.11,  10.85) 05/27/2023   23:01:55  ( -70.13,  10.79)    3.34                65
 05/27/2023   23:51:35   (  70.04, 178.26) 05/27/2023   23:51:22  (  70.03, 178.28)    1.59                13
 05/28/2023   00:42:09   ( -69.53, -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  ( -70.08, 126.60)    2.08                36
 05/30/2023   16:08:29   (  69.97, -65.86) 05/30/2023   16:07:48  (  69.97, -65.91)    1.88                41
 06/02/2023   06:44:02   (  70.37,  74.66) 06/02/2023   06:45:14  (  70.27,  75.13)   20.92                72
 06/02/2023   07:34:40   ( -70.07,-117.56) 06/02/2023   07:34:46  ( -70.05,-117.55)    1.81                 6
 06/02/2023   08:25:24   (  69.95,  49.92) 06/02/2023   08:24:13  (  69.94,  49.94)    1.60                71
 06/04/2023   23:00:51   (  70.10,-169.16) 06/04/2023   23:01:40  (  70.11,-169.21)    2.04                49
 06/04/2023   23:51:33   ( -70.01,  -1.70) 06/04/2023   23:51:10  ( -70.00,  -1.73)    1.28                23
 06/07/2023   14:27:17   ( -71.00, 137.86) 06/07/2023   14:28:24  ( -70.91, 140.23)   86.30                67
 06/07/2023   15:17:46   (  70.10, -53.40) 06/07/2023   15:18:04  (  70.08, -53.35)    2.97                18