Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 10 10.  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)
 10/10/2023   23:50:55   ( -70.41,  -2.29) 10/10/2023   23:52:06  ( -70.27,  -1.30)   40.01                71
 10/11/2023   00:41:31   (  69.87, 165.85) 10/11/2023   00:41:38  (  69.89, 165.80)    2.97                 7
 10/11/2023   01:32:13   ( -69.78, -26.70) 10/11/2023   01:31:08  ( -69.78, -26.71)    0.21                65
 10/13/2023   16:07:40   ( -69.97, 114.16) 10/13/2023   16:08:43  ( -69.96, 114.14)    1.77                63
 10/13/2023   16:58:24   (  69.86, -78.36) 10/13/2023   16:58:10  (  69.85, -78.37)    1.10                14
 10/13/2023   17:48:58   ( -69.35,  89.70) 10/13/2023   17:47:47  ( -69.36,  88.60)   43.34                71
 10/16/2023   08:24:32   ( -69.93,-129.99) 10/16/2023   08:25:14  ( -69.93,-130.03)    1.60                42
 10/16/2023   09:15:16   (  69.82,  37.49) 10/16/2023   09:14:41  (  69.82,  37.46)    1.04                35
 10/18/2023   23:50:55   (  70.73, 177.22) 10/18/2023   23:52:02  (  70.61, 179.21)   74.38                67
 10/19/2023   00:41:23   ( -69.89, -14.16) 10/19/2023   00:41:43  ( -69.91, -14.18)    1.99                20
 10/19/2023   01:32:07   (  69.79, 153.31) 10/19/2023   01:31:10  (  69.79, 153.31)    0.76                57
 10/21/2023   16:07:33   (  69.98, -65.82) 10/21/2023   16:08:42  (  69.99, -65.82)    1.48                69
 10/21/2023   16:58:15   ( -69.88, 101.65) 10/21/2023   16:58:12  ( -69.89, 101.68)    2.01                 3
 10/21/2023   17:48:54   (  69.51, -90.50) 10/21/2023   17:47:42  (  69.61, -91.07)   24.54                72