Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 10 12.  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)
 10/13/2023   16:07:40   ( -70.00, 114.12) 10/13/2023   16:08:42  ( -69.99, 114.17)    2.67                62
 10/13/2023   16:58:24   (  69.88, -78.40) 10/13/2023   16:58:09  (  69.88, -78.33)    2.68                15
 10/13/2023   17:48:57   ( -69.32,  89.74) 10/13/2023   17:47:46  ( -69.39,  88.63)   44.00                71
 10/16/2023   08:24:32   ( -69.96,-130.04) 10/16/2023   08:25:13  ( -69.96,-129.99)    1.79                41
 10/16/2023   09:15:16   (  69.84,  37.44) 10/16/2023   09:14:40  (  69.85,  37.51)    2.65                36
 10/18/2023   23:50:55   (  70.71, 177.25) 10/18/2023   23:52:03  (  70.59, 179.17)   72.17                68
 10/19/2023   00:41:24   ( -69.93, -14.21) 10/19/2023   00:41:43  ( -69.94, -14.14)    2.84                19
 10/19/2023   01:32:07   (  69.77, 153.34) 10/19/2023   01:31:11  (  69.77, 153.27)    2.44                56
 10/21/2023   16:07:33   (  69.96, -65.80) 10/21/2023   16:08:43  (  69.96, -65.85)    1.91                70
 10/21/2023   16:58:14   ( -69.87, 101.66) 10/21/2023   16:58:12  ( -69.86, 101.64)    1.11                 2
 10/21/2023   17:48:54   (  69.55, -90.56) 10/21/2023   17:47:42  (  69.58, -91.10)   21.25                72
 10/24/2023   08:24:23   (  69.92,  50.05) 10/24/2023   08:25:10  (  69.95,  50.01)    3.21                47
 10/24/2023   09:15:05   ( -69.82,-142.48) 10/24/2023   09:14:40  ( -69.84,-142.50)    2.94                25