Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 10 5.  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)
 10/05/2023   16:07:46   (  69.93, -65.79) 10/05/2023   16:08:36  (  69.94, -65.87)    3.16                50
 10/05/2023   16:58:28   ( -69.85, 101.65) 10/05/2023   16:58:06  ( -69.83, 101.61)    2.52                22
 10/05/2023   17:48:55   (  68.82, -89.58) 10/05/2023   17:47:49  (  68.84, -92.06)   99.38                66
 10/08/2023   08:24:39   (  69.94,  49.96) 10/08/2023   08:25:05  (  69.95,  50.02)    2.25                26
 10/08/2023   09:15:20   ( -69.81,-142.52) 10/08/2023   09:14:36  ( -69.79,-142.57)    3.24                44
 10/10/2023   23:50:53   ( -70.30,  -2.11) 10/10/2023   23:52:05  ( -70.19,  -1.41)   29.44                72
 10/11/2023   00:41:32   (  69.92, 165.77) 10/11/2023   00:41:35  (  69.91, 165.85)    3.21                 3
 10/11/2023   01:32:13   ( -69.78, -26.70) 10/11/2023   01:31:05  ( -69.81, -26.66)    3.37                68
 10/13/2023   16:07:40   ( -69.97, 114.17) 10/13/2023   16:08:38  ( -69.95, 114.14)    2.89                58
 10/13/2023   16:58:24   (  69.86, -78.36) 10/13/2023   16:58:05  (  69.83, -78.38)    3.21                19
 10/13/2023   17:48:54   ( -69.13,  90.01) 10/13/2023   17:47:45  ( -69.18,  88.38)   64.77                69
 10/16/2023   08:24:32   ( -69.92,-129.98) 10/16/2023   08:25:06  ( -69.93,-129.99)    1.90                34
 10/16/2023   09:15:16   (  69.81,  37.49) 10/16/2023   09:14:33  (  69.82,  37.49)    0.62                43
 10/18/2023   23:50:48   (  70.35, 177.82) 10/18/2023   23:51:58  (  70.26, 178.73)   35.81                70
 10/19/2023   00:41:23   ( -69.88, -14.14) 10/19/2023   00:41:33  ( -69.88, -14.17)    1.18                10
 10/19/2023   01:32:07   (  69.78, 153.32) 10/19/2023   01:31:00  (  69.76, 153.31)    2.22                67