Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 12 8.  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)
 12/08/2023   15:17:58   ( -70.44, 125.86) 12/08/2023   15:19:08  ( -70.35, 127.06)   46.08                70
 12/08/2023   16:08:33   (  69.86, -65.92) 12/08/2023   16:08:42  (  69.86, -65.98)    2.29                 9
 12/08/2023   16:59:15   ( -69.76, 101.53) 12/08/2023   16:58:12  ( -69.75, 101.49)    2.61                63
 12/11/2023   07:34:45   ( -69.97,-117.63) 12/11/2023   07:35:41  ( -69.97,-117.58)    1.68                56
 12/11/2023   08:25:29   (  69.85,  49.85) 12/11/2023   08:25:08  (  69.86,  49.91)    2.74                21
 12/11/2023   09:15:58   ( -69.07,-141.70) 12/11/2023   09:14:49  ( -69.14,-143.42)   68.59                69
 12/13/2023   23:51:40   ( -69.91,  -1.78) 12/13/2023   23:52:08  ( -69.90,  -1.79)    1.93                28
 12/14/2023   00:42:24   (  69.81, 165.69) 12/14/2023   00:41:35  (  69.79, 165.70)    1.94                49
 12/16/2023   15:17:52   (  69.97, -53.41) 12/16/2023   15:19:03  (  69.97, -53.43)    0.70                71
 12/16/2023   16:08:34   ( -69.87, 114.05) 12/16/2023   16:08:33  ( -69.86, 114.05)    1.46                 1
 12/16/2023   16:59:15   (  69.60, -78.24) 12/16/2023   16:58:02  (  69.64, -78.61)   14.60                73
 12/19/2023   07:34:47   (  69.94,  62.41) 12/19/2023   07:35:28  (  69.96,  62.46)    3.05                41
 12/19/2023   08:25:29   ( -69.83,-130.12) 12/19/2023   08:24:58  ( -69.85,-130.06)    2.89                31
 12/21/2023   23:01:09   ( -70.59,   9.85) 12/21/2023   23:02:18  ( -70.48,  11.46)   60.79                69
 12/21/2023   23:51:41   (  69.85, 178.30) 12/21/2023   23:51:54  (  69.87, 178.23)    3.21                13
 12/22/2023   00:42:23   ( -69.75, -14.23) 12/22/2023   00:41:24  ( -69.77, -14.28)    2.51                59