Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 10 27.  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)
 10/29/2023   16:07:55   ( -69.95, 114.12) 10/29/2023   16:08:42  ( -69.92, 114.10)    2.88                47
 10/29/2023   16:58:39   (  69.83, -78.39) 10/29/2023   16:58:09  (  69.82, -78.40)    1.05                30
 11/01/2023   07:34:21   (  70.54,  61.64) 11/01/2023   07:35:30  (  70.46,  63.12)   55.75                69
 11/01/2023   08:24:53   ( -69.91,-130.07) 11/01/2023   08:25:08  ( -69.90,-130.04)    1.56                15
 11/01/2023   09:15:37   (  69.80,  37.41) 11/01/2023   09:14:35  (  69.80,  37.46)    1.97                62
 11/03/2023   23:51:09   (  69.93, 178.33) 11/03/2023   23:52:05  (  69.96, 178.31)    3.31                56
 11/04/2023   00:41:51   ( -69.83, -14.20) 11/04/2023   00:41:35  ( -69.85, -14.22)    2.20                16
 11/04/2023   01:32:22   (  69.03, 154.26) 11/04/2023   01:31:14  (  69.08, 152.39)   74.39                68
 11/06/2023   16:08:08   (  69.92, -65.90) 11/06/2023   16:08:31  (  69.93, -65.84)    2.30                23
 11/06/2023   16:58:50   ( -69.82, 101.57) 11/06/2023   16:58:01  ( -69.82, 101.64)    2.53                49
 11/09/2023   07:34:22   ( -69.97,-117.53) 11/09/2023   07:35:30  ( -69.98,-117.52)    1.12                68
 11/09/2023   08:25:06   (  69.87,  49.94) 11/09/2023   08:24:57  (  69.86,  49.96)    1.06                 9
 11/09/2023   09:15:43   ( -69.49,-142.20) 11/09/2023   09:14:31  ( -69.54,-142.85)   25.81                72