Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 8 8.  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)
 08/10/2023   16:07:42   ( -69.99, 114.21) 08/10/2023   16:08:15  ( -70.00, 114.23)    1.81                33
 08/10/2023   16:58:26   (  69.87, -78.31) 08/10/2023   16:57:43  (  69.85, -78.34)    2.90                43
 08/13/2023   07:33:59   (  70.47,  61.92) 08/13/2023   07:35:09  (  70.40,  63.05)   43.02                70
 08/13/2023   08:24:33   ( -69.96,-129.97) 08/13/2023   08:24:45  ( -69.95,-129.95)    1.20                12
 08/13/2023   09:15:17   (  69.85,  37.51) 08/13/2023   09:14:12  (  69.85,  37.55)    1.65                65
 08/15/2023   23:50:42   (  70.04, 178.38) 08/15/2023   23:51:44  (  70.04, 178.42)    1.56                62
 08/16/2023   00:41:24   ( -69.95, -14.16) 08/16/2023   00:41:14  ( -69.93, -14.10)    3.14                10
 08/16/2023   01:31:59   (  69.36, 154.00) 08/16/2023   01:30:48  (  69.43, 152.87)   45.21                71
 08/18/2023   16:07:32   (  69.98, -65.75) 08/18/2023   16:08:13  (  69.98, -65.77)    0.92                41
 08/18/2023   16:58:14   ( -69.89, 101.71) 08/18/2023   16:57:43  ( -69.87, 101.71)    1.83                31
 08/21/2023   07:33:53   ( -70.88,-118.69) 08/21/2023   07:35:00  ( -70.77,-116.37)   85.88                67
 08/21/2023   08:24:21   (  69.94,  50.10) 08/21/2023   08:24:40  (  69.95,  50.07)    1.58                19
 08/21/2023   09:15:03   ( -69.84,-142.43) 08/21/2023   09:14:10  ( -69.84,-142.44)    0.28                53