Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 9 30.  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)
 09/30/2023   07:34:13   (  70.73,  61.40) 09/30/2023   07:35:21  (  70.62,  63.37)   73.61                68
 09/30/2023   08:24:41   ( -69.92,-130.00) 09/30/2023   08:25:02  ( -69.91,-130.03)    1.54                21
 09/30/2023   09:15:25   (  69.79,  37.50) 09/30/2023   09:14:29  (  69.80,  37.47)    1.63                56
 10/02/2023   23:50:53   (  69.98, 178.36) 10/02/2023   23:52:04  (  70.01, 178.35)    3.05                71
 10/03/2023   00:41:35   ( -69.90, -14.20) 10/03/2023   00:41:34  ( -69.90, -14.16)    1.35                 1
 10/03/2023   01:32:16   (  69.61, 153.53) 10/03/2023   01:31:03  (  69.68, 153.18)   15.54                73
 10/05/2023   16:07:47   (  69.97, -65.86) 10/05/2023   16:08:36  (  69.96, -65.84)    1.57                49
 10/05/2023   16:58:28   ( -69.83, 101.67) 10/05/2023   16:58:06  ( -69.86, 101.65)    2.81                22
 10/05/2023   17:48:55   (  68.81, -89.57) 10/05/2023   17:47:49  (  68.86, -92.03)   99.08                66
 10/08/2023   08:24:39   (  69.92,  49.99) 10/08/2023   08:25:06  (  69.93,  49.99)    0.54                27
 10/08/2023   09:15:21   ( -69.83,-142.56) 10/08/2023   09:14:36  ( -69.83,-142.51)    1.67                45
 10/10/2023   23:50:54   ( -70.31,  -2.14) 10/10/2023   23:52:06  ( -70.20,  -1.39)   30.71                72
 10/11/2023   00:41:32   (  69.89, 165.82) 10/11/2023   00:41:37  (  69.86, 165.78)    3.39                 5
 10/11/2023   01:32:14   ( -69.79, -26.72) 10/11/2023   01:31:07  ( -69.76, -26.73)    3.35                67
 10/13/2023   16:07:41   ( -69.96, 114.17) 10/13/2023   16:08:39  ( -69.98, 114.18)    1.95                58
 10/13/2023   16:58:25   (  69.86, -78.36) 10/13/2023   16:58:06  (  69.86, -78.34)    1.15                19
 10/13/2023   17:48:56   ( -69.18,  89.94) 10/13/2023   17:47:46  ( -69.22,  88.42)   60.03                70