Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 9 6.  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)
 09/06/2023   07:34:11   ( -70.81,-118.69) 09/06/2023   07:35:18  ( -70.72,-116.50)   80.98                67
 09/06/2023   08:24:41   (  69.95,  49.98) 09/06/2023   08:24:57  (  69.96,  50.04)    2.83                16
 09/06/2023   09:15:22   ( -69.82,-142.51) 09/06/2023   09:14:27  ( -69.85,-142.48)    3.37                55
 09/08/2023   23:50:52   ( -70.02,  -1.66) 09/08/2023   23:52:02  ( -70.04,  -1.62)    2.59                70
 09/09/2023   00:41:36   (  69.89, 165.84) 09/09/2023   00:41:30  (  69.88, 165.80)    1.82                 6
 09/09/2023   01:32:15   ( -69.65, -26.49) 09/09/2023   01:31:02  ( -69.66, -26.87)   14.58                73
 09/11/2023   16:07:47   ( -69.96, 114.19) 09/11/2023   16:08:35  ( -69.96, 114.14)    2.03                48
 09/11/2023   16:58:31   (  69.84, -78.32) 09/11/2023   16:58:02  (  69.85, -78.37)    2.25                29
 09/14/2023   07:34:17   (  70.89,  61.15) 09/14/2023   07:35:23  (  70.80,  63.61)   90.40                66
 09/14/2023   08:24:42   ( -69.91,-129.98) 09/14/2023   08:25:07  ( -69.93,-130.03)    2.58                25
 09/14/2023   09:15:27   (  69.84,  37.43) 09/14/2023   09:14:34  (  69.82,  37.46)    3.18                53
 09/16/2023   23:50:56   (  70.07, 178.24) 09/16/2023   23:52:07  (  70.05, 178.39)    6.02                71
 09/17/2023   00:41:37   ( -69.93, -14.23) 09/17/2023   00:41:38  ( -69.90, -14.19)    3.16                 1
 09/17/2023   01:32:19   (  69.70, 153.41) 09/17/2023   01:31:06  (  69.73, 153.22)    8.14                73
 09/19/2023   16:07:50   (  69.99, -65.87) 09/19/2023   16:08:40  (  69.97, -65.86)    2.06                50
 09/19/2023   16:58:32   ( -69.89, 101.58) 09/19/2023   16:58:10  ( -69.87, 101.64)    3.26                22