Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 10 20.  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)
 10/21/2023   16:07:42   (  69.98, -65.86) 10/21/2023   16:08:43  (  69.97, -65.85)    0.52                61
 10/21/2023   16:58:24   ( -69.89, 101.59) 10/21/2023   16:58:13  ( -69.86, 101.63)    3.11                11
 10/21/2023   17:48:58   (  69.23, -90.15) 10/21/2023   17:47:48  (  69.31, -91.47)   52.80                70
 10/24/2023   08:24:41   (  69.91,  49.99) 10/24/2023   08:25:12  (  69.93,  49.98)    2.68                31
 10/24/2023   09:15:23   ( -69.81,-142.55) 10/24/2023   09:14:42  ( -69.82,-142.54)    0.93                41
 10/26/2023   23:51:00   ( -70.17,  -1.97) 10/26/2023   23:52:11  ( -70.12,  -1.51)   18.39                71
 10/27/2023   00:41:41   (  69.90, 165.75) 10/27/2023   00:41:40  (  69.90, 165.83)    2.95                 1
 10/27/2023   01:32:22   ( -69.75, -26.71) 10/27/2023   01:31:11  ( -69.74, -26.76)    2.39                71
 10/29/2023   16:07:55   ( -69.96, 114.11) 10/29/2023   16:08:40  ( -69.95, 114.14)    1.53                45
 10/29/2023   16:58:39   (  69.85, -78.42) 10/29/2023   16:58:07  (  69.83, -78.38)    2.10                32
 11/01/2023   07:34:21   (  70.49,  61.72) 11/01/2023   07:35:30  (  70.38,  63.02)   49.94                69
 11/01/2023   08:24:54   ( -69.91,-130.07) 11/01/2023   08:25:07  ( -69.89,-130.04)    1.62                13
 11/01/2023   09:15:38   (  69.80,  37.40) 11/01/2023   09:14:34  (  69.78,  37.44)    2.83                64