Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 9 8.  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)
 09/08/2023   23:50:52   ( -70.01,  -1.65) 09/08/2023   23:52:02  ( -70.02,  -1.65)    1.09                70
 09/09/2023   00:41:36   (  69.88, 165.85) 09/09/2023   00:41:30  (  69.86, 165.78)    3.28                 6
 09/09/2023   01:32:14   ( -69.59, -26.40) 09/09/2023   01:31:02  ( -69.64, -26.89)   19.83                72
 09/11/2023   16:07:48   ( -70.00, 114.12) 09/11/2023   16:08:33  ( -70.00, 114.20)    3.12                45
 09/11/2023   16:58:31   (  69.83, -78.30) 09/11/2023   16:58:01  (  69.84, -78.38)    3.23                30
 09/14/2023   07:34:14   (  70.78,  61.35) 09/14/2023   07:35:21  (  70.71,  63.49)   78.91                67
 09/14/2023   08:24:42   ( -69.96,-130.04) 09/14/2023   08:25:03  ( -69.95,-129.99)    2.09                21
 09/14/2023   09:15:26   (  69.83,  37.45) 09/14/2023   09:14:30  (  69.84,  37.50)    2.00                56
 09/16/2023   23:50:55   (  70.00, 178.34) 09/16/2023   23:52:04  (  69.97, 178.29)    3.35                69
 09/17/2023   00:41:37   ( -69.91, -14.21) 09/17/2023   00:41:33  ( -69.93, -14.14)    3.13                 4
 09/17/2023   01:32:16   (  69.53, 153.67) 09/17/2023   01:31:04  (  69.59, 153.05)   25.13                72
 09/19/2023   16:07:50   (  69.97, -65.85) 09/19/2023   16:08:33  (  69.98, -65.81)    1.72                43
 09/19/2023   16:58:32   ( -69.88, 101.61) 09/19/2023   16:58:03  ( -69.88, 101.68)    2.74                29