Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 12 4.  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)
 12/05/2023   23:51:38   (  69.90, 178.25) 12/05/2023   23:52:15  (  69.92, 178.21)    2.98                37
 12/06/2023   00:42:20   ( -69.80, -14.29) 12/06/2023   00:41:45  ( -69.81, -14.32)    1.14                35
 12/08/2023   15:17:58   ( -70.43, 125.89) 12/08/2023   15:19:09  ( -70.32, 127.02)   43.79                71
 12/08/2023   16:08:34   (  69.90, -65.98) 12/08/2023   16:08:42  (  69.88, -65.96)    2.28                 8
 12/08/2023   16:59:15   ( -69.75, 101.56) 12/08/2023   16:58:12  ( -69.77, 101.52)    2.83                63
 12/11/2023   07:34:45   ( -69.96,-117.62) 12/11/2023   07:35:41  ( -69.96,-117.59)    1.17                56
 12/11/2023   08:25:29   (  69.86,  49.85) 12/11/2023   08:25:08  (  69.85,  49.90)    2.21                21
 12/11/2023   09:15:58   ( -69.07,-141.70) 12/11/2023   09:14:49  ( -69.13,-143.43)   68.98                69
 12/13/2023   23:51:38   ( -69.89,  -1.73) 12/13/2023   23:52:06  ( -69.90,  -1.79)    2.30                28
 12/14/2023   00:42:22   (  69.78, 165.73) 12/14/2023   00:41:33  (  69.78, 165.70)    1.24                49
 12/16/2023   15:17:51   (  69.98, -53.42) 12/16/2023   15:19:00  (  70.00, -53.37)    3.29                69
 12/16/2023   16:08:33   ( -69.88, 114.05) 12/16/2023   16:08:30  ( -69.90, 114.12)    3.43                 3
 12/16/2023   16:59:13   (  69.56, -78.17) 12/16/2023   16:58:00  (  69.61, -78.63)   18.53                73