Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 9 7.  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)    0.54                70
 09/09/2023   00:41:36   (  69.88, 165.85) 09/09/2023   00:41:29  (  69.91, 165.85)    3.57                 7
 09/09/2023   01:32:14   ( -69.59, -26.41) 09/09/2023   01:31:01  ( -69.69, -26.82)   19.58                73
 09/11/2023   16:07:47   ( -69.96, 114.19) 09/11/2023   16:08:34  ( -69.94, 114.12)    3.35                47
 09/11/2023   16:58:31   (  69.83, -78.31) 09/11/2023   16:58:01  (  69.83, -78.38)    2.86                30
 09/14/2023   07:34:15   (  70.78,  61.34) 09/14/2023   07:35:22  (  70.71,  63.49)   79.37                67
 09/14/2023   08:24:43   ( -69.96,-130.05) 09/14/2023   08:25:04  ( -69.95,-129.99)    2.61                21
 09/14/2023   09:15:27   (  69.84,  37.44) 09/14/2023   09:14:31  (  69.84,  37.50)    2.29                56
 09/16/2023   23:50:55   (  70.01, 178.33) 09/16/2023   23:52:04  (  69.98, 178.30)    3.31                69
 09/17/2023   00:41:36   ( -69.87, -14.14) 09/17/2023   00:41:34  ( -69.88, -14.21)    2.70                 2
 09/17/2023   01:32:16   (  69.53, 153.65) 09/17/2023   01:31:04  (  69.60, 153.05)   24.31                72
 09/19/2023   16:07:50   (  69.98, -65.86) 09/19/2023   16:08:33  (  69.99, -65.80)    2.75                43
 09/19/2023   16:58:31   ( -69.83, 101.67) 09/19/2023   16:58:04  ( -69.84, 101.62)    2.03                27