Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 10 7.  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)
 10/08/2023   08:24:39   (  69.90,  50.03) 10/08/2023   08:25:06  (  69.93,  49.99)    3.21                27
 10/08/2023   09:15:21   ( -69.82,-142.53) 10/08/2023   09:14:36  ( -69.82,-142.53)    0.18                45
 10/10/2023   23:50:53   ( -70.31,  -2.13) 10/10/2023   23:52:04  ( -70.20,  -1.38)   30.80                71
 10/11/2023   00:41:31   (  69.88, 165.83) 10/11/2023   00:41:35  (  69.88, 165.80)    1.28                 4
 10/11/2023   01:32:13   ( -69.79, -26.72) 10/11/2023   01:31:05  ( -69.77, -26.71)    2.55                68
 10/13/2023   16:07:40   ( -69.98, 114.14) 10/13/2023   16:08:36  ( -70.00, 114.21)    3.03                56
 10/13/2023   16:58:23   (  69.82, -78.30) 10/13/2023   16:58:04  (  69.83, -78.37)    3.12                19
 10/13/2023   17:48:53   ( -69.09,  90.06) 10/13/2023   17:47:44  ( -69.18,  88.38)   67.38                69
 10/16/2023   08:24:32   ( -69.94,-130.00) 10/16/2023   08:25:05  ( -69.91,-130.02)    3.41                33
 10/16/2023   09:15:16   (  69.83,  37.46) 10/16/2023   09:14:31  (  69.85,  37.54)    3.37                45
 10/18/2023   23:50:47   (  70.27, 177.95) 10/18/2023   23:51:58  (  70.20, 178.65)   27.45                71
 10/19/2023   00:41:24   ( -69.90, -14.18) 10/19/2023   00:41:32  ( -69.88, -14.17)    3.22                 8
 10/19/2023   01:32:07   (  69.75, 153.36) 10/19/2023   01:30:59  (  69.76, 153.31)    2.40                68