Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 8 25.  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)
 08/26/2023   16:07:41   ( -69.99, 114.19) 08/26/2023   16:08:24  ( -69.97, 114.18)    2.37                43
 08/26/2023   16:58:25   (  69.86, -78.31) 08/26/2023   16:57:51  (  69.87, -78.31)    0.92                34
 08/29/2023   07:34:06   (  70.67,  61.57) 08/29/2023   07:35:15  (  70.56,  63.28)   64.02                69
 08/29/2023   08:24:36   ( -69.95,-129.99) 08/29/2023   08:24:54  ( -69.95,-129.97)    0.80                18
 08/29/2023   09:15:20   (  69.83,  37.51) 08/29/2023   09:14:21  (  69.85,  37.53)    2.89                59
 08/31/2023   23:50:50   (  70.00, 178.38) 08/31/2023   23:51:55  (  70.02, 178.37)    1.49                65
 09/01/2023   00:41:32   ( -69.92, -14.18) 09/01/2023   00:41:25  ( -69.91, -14.15)    1.52                 7
 09/01/2023   01:32:09   (  69.42, 153.85) 09/01/2023   01:30:58  (  69.47, 152.90)   37.77                71
 09/03/2023   16:07:46   (  69.98, -65.83) 09/03/2023   16:08:25  (  70.00, -65.77)    3.03                39
 09/03/2023   16:58:27   ( -69.84, 101.70) 09/03/2023   16:57:56  ( -69.84, 101.64)    2.34                31
 09/06/2023   07:34:10   ( -70.71,-118.52) 09/06/2023   07:35:18  ( -70.62,-116.63)   70.44                68
 09/06/2023   08:24:41   (  69.91,  50.04) 09/06/2023   08:24:56  (  69.90,  49.98)    2.60                15
 09/06/2023   09:15:23   ( -69.82,-142.51) 09/06/2023   09:14:26  ( -69.80,-142.53)    2.59                57