Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 8 6.  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)
 08/07/2023   23:50:51   ( -70.02,  -1.62) 08/07/2023   23:51:45  ( -70.03,  -1.61)    1.31                54
 08/08/2023   00:41:35   (  69.90, 165.86) 08/08/2023   00:41:12  (  69.93, 165.90)    3.36                23
 08/08/2023   01:32:03   ( -69.07, -25.63) 08/08/2023   01:30:55  ( -69.10, -27.59)   78.21                68
 08/10/2023   16:07:42   ( -69.98, 114.22) 08/10/2023   16:08:16  ( -69.96, 114.17)    3.41                34
 08/10/2023   16:58:26   (  69.87, -78.31) 08/10/2023   16:57:43  (  69.85, -78.33)    1.98                43
 08/13/2023   07:33:59   (  70.47,  61.93) 08/13/2023   07:35:09  (  70.40,  63.06)   43.05                70
 08/13/2023   08:24:33   ( -69.95,-129.96) 08/13/2023   08:24:45  ( -69.96,-129.94)    1.37                12
 08/13/2023   09:15:17   (  69.85,  37.51) 08/13/2023   09:14:12  (  69.86,  37.56)    2.37                65
 08/15/2023   23:50:42   (  70.03, 178.39) 08/15/2023   23:51:44  (  70.05, 178.44)    2.83                62
 08/16/2023   00:41:24   ( -69.94, -14.15) 08/16/2023   00:41:14  ( -69.94, -14.08)    2.77                10
 08/16/2023   01:31:59   (  69.35, 154.01) 08/16/2023   01:30:49  (  69.39, 152.81)   47.21                70
 08/18/2023   16:07:31   (  69.97, -65.74) 08/18/2023   16:08:12  (  70.00, -65.75)    2.80                41
 08/18/2023   16:58:13   ( -69.88, 101.73) 08/18/2023   16:57:42  ( -69.89, 101.74)    2.02                31