Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 9 18.  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)
 09/19/2023   16:07:50   (  69.97, -65.85) 09/19/2023   16:08:33  (  69.97, -65.83)    0.86                43
 09/19/2023   16:58:31   ( -69.84, 101.66) 09/19/2023   16:58:03  ( -69.86, 101.64)    1.70                28
 09/22/2023   07:34:15   ( -70.82,-118.72) 09/22/2023   07:35:22  ( -70.73,-116.47)   82.95                67
 09/22/2023   08:24:44   (  69.91,  50.02) 09/22/2023   08:25:02  (  69.91,  49.98)    1.72                18
 09/22/2023   09:15:26   ( -69.82,-142.54) 09/22/2023   09:14:32  ( -69.80,-142.54)    2.29                54
 09/24/2023   23:50:53   ( -69.97,  -1.62) 09/24/2023   23:52:02  ( -69.99,  -1.67)    2.90                69
 09/25/2023   00:41:38   (  69.90, 165.79) 09/25/2023   00:41:29  (  69.87, 165.81)    3.05                 9
 09/25/2023   01:32:15   ( -69.55, -26.38) 09/25/2023   01:31:02  ( -69.60, -26.92)   22.10                73
 09/27/2023   16:07:48   ( -69.97, 114.15) 09/27/2023   16:08:29  ( -69.97, 114.20)    1.76                41
 09/27/2023   16:58:32   (  69.85, -78.37) 09/27/2023   16:57:56  (  69.85, -78.32)    1.80                36
 09/30/2023   07:34:09   (  70.50,  61.79) 09/30/2023   07:35:19  (  70.40,  63.08)   49.30                70
 09/30/2023   08:24:42   ( -69.93,-130.02) 09/30/2023   08:24:56  ( -69.91,-129.99)    2.01                14
 09/30/2023   09:15:26   (  69.81,  37.46) 09/30/2023   09:14:23  (  69.79,  37.49)    2.64                63