Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 10 24.  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)
 10/26/2023   23:50:59   ( -70.17,  -1.96) 10/26/2023   23:52:11  ( -70.11,  -1.52)   17.65                72
 10/27/2023   00:41:40   (  69.89, 165.77) 10/27/2023   00:41:40  (  69.90, 165.82)    2.36                 0
 10/27/2023   01:32:22   ( -69.80, -26.78) 10/27/2023   01:31:10  ( -69.79, -26.70)    3.06                72
 10/29/2023   16:07:55   ( -69.96, 114.10) 10/29/2023   16:08:41  ( -69.97, 114.16)    2.17                46
 10/29/2023   16:58:39   (  69.85, -78.42) 10/29/2023   16:58:08  (  69.86, -78.35)    2.93                31
 11/01/2023   07:34:22   (  70.55,  61.62) 11/01/2023   07:35:31  (  70.44,  63.10)   56.57                69
 11/01/2023   08:24:53   ( -69.87,-130.01) 11/01/2023   08:25:09  ( -69.89,-130.05)    2.96                16
 11/01/2023   09:15:37   (  69.76,  37.46) 11/01/2023   09:14:36  (  69.78,  37.44)    2.73                61
 11/03/2023   23:51:09   (  69.95, 178.31) 11/03/2023   23:52:05  (  69.95, 178.29)    0.75                56
 11/04/2023   00:41:51   ( -69.84, -14.22) 11/04/2023   00:41:35  ( -69.84, -14.22)    0.31                16
 11/04/2023   01:32:22   (  69.04, 154.24) 11/04/2023   01:31:14  (  69.07, 152.38)   73.96                68
 11/06/2023   16:08:08   (  69.93, -65.92) 11/06/2023   16:08:31  (  69.92, -65.85)    2.78                23
 11/06/2023   16:58:50   ( -69.83, 101.56) 11/06/2023   16:58:01  ( -69.82, 101.64)    2.97                49