Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 10 1.  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)
 10/02/2023   23:50:53   (  69.99, 178.35) 10/02/2023   23:52:04  (  70.00, 178.34)    1.11                71
 10/03/2023   00:41:35   ( -69.90, -14.21) 10/03/2023   00:41:34  ( -69.89, -14.18)    2.04                 1
 10/03/2023   01:32:16   (  69.62, 153.52) 10/03/2023   01:31:03  (  69.67, 153.17)   14.67                73
 10/05/2023   16:07:47   (  69.98, -65.87) 10/05/2023   16:08:36  (  69.95, -65.85)    3.42                49
 10/05/2023   16:58:28   ( -69.84, 101.66) 10/05/2023   16:58:06  ( -69.85, 101.63)    1.04                22
 10/05/2023   17:48:55   (  68.82, -89.58) 10/05/2023   17:47:49  (  68.85, -92.04)   98.88                66
 10/08/2023   08:24:39   (  69.93,  49.98) 10/08/2023   08:25:06  (  69.92,  49.99)    1.14                27
 10/08/2023   09:15:21   ( -69.84,-142.57) 10/08/2023   09:14:36  ( -69.82,-142.52)    2.97                45
 10/10/2023   23:50:54   ( -70.32,  -2.15) 10/10/2023   23:52:05  ( -70.25,  -1.32)   32.41                71
 10/11/2023   00:41:32   (  69.90, 165.81) 10/11/2023   00:41:36  (  69.92, 165.85)    2.69                 4
 10/11/2023   01:32:13   ( -69.75, -26.66) 10/11/2023   01:31:07  ( -69.76, -26.73)    2.97                66
 10/13/2023   16:07:41   ( -69.98, 114.15) 10/13/2023   16:08:39  ( -69.99, 114.19)    1.77                58
 10/13/2023   16:58:25   (  69.87, -78.38) 10/13/2023   16:58:06  (  69.87, -78.33)    2.08                19
 10/13/2023   17:48:56   ( -69.19,  89.92) 10/13/2023   17:47:46  ( -69.22,  88.43)   59.05                70