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   16:07:40   ( -69.98, 114.21) 08/26/2023   16:08:23  ( -69.98, 114.20)    0.66                43
 08/26/2023   16:58:24   (  69.85, -78.29) 08/26/2023   16:57:50  (  69.88, -78.30)    3.42                34
 08/29/2023   07:34:07   (  70.71,  61.51) 08/29/2023   07:35:15  (  70.57,  63.29)   67.80                68
 08/29/2023   08:24:36   ( -69.94,-129.97) 08/29/2023   08:24:54  ( -69.96,-129.95)    2.87                18
 08/29/2023   09:15:20   (  69.82,  37.52) 08/29/2023   09:14:22  (  69.81,  37.47)    2.12                58
 08/31/2023   23:50:50   (  70.00, 178.39) 08/31/2023   23:51:55  (  70.03, 178.39)    3.61                65
 09/01/2023   00:41:32   ( -69.91, -14.16) 09/01/2023   00:41:25  ( -69.92, -14.13)    1.83                 7
 09/01/2023   01:32:09   (  69.42, 153.87) 09/01/2023   01:30:58  (  69.48, 152.91)   37.99                71
 09/03/2023   16:07:46   (  69.98, -65.82) 09/03/2023   16:08:26  (  69.96, -65.83)    2.27                40
 09/03/2023   16:58:27   ( -69.83, 101.71) 09/03/2023   16:57:56  ( -69.85, 101.65)    2.94                31
 09/06/2023   07:34:09   ( -70.71,-118.52) 09/06/2023   07:35:17  ( -70.63,-116.62)   70.53                68
 09/06/2023   08:24:40   (  69.91,  50.04) 09/06/2023   08:24:55  (  69.91,  49.99)    1.94                15
 09/06/2023   09:15:22   ( -69.82,-142.51) 09/06/2023   09:14:25  ( -69.81,-142.52)    1.00                57