Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 9 17.  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, -65.84) 09/19/2023   16:08:33  (  69.98, -65.82)    1.40                43
 09/19/2023   16:58:31   ( -69.84, 101.67) 09/19/2023   16:58:03  ( -69.87, 101.66)    3.36                28
 09/22/2023   07:34:15   ( -70.81,-118.71) 09/22/2023   07:35:22  ( -70.75,-116.44)   83.35                67
 09/22/2023   08:24:45   (  69.95,  49.95) 09/22/2023   08:25:02  (  69.93,  50.01)    2.91                17
 09/22/2023   09:15:26   ( -69.82,-142.53) 09/22/2023   09:14:32  ( -69.83,-142.51)    1.50                54
 09/24/2023   23:50:54   ( -70.01,  -1.68) 09/24/2023   23:52:02  ( -70.03,  -1.62)    3.13                68
 09/25/2023   00:41:38   (  69.89, 165.81) 09/25/2023   00:41:30  (  69.86, 165.79)    3.37                 8
 09/25/2023   01:32:15   ( -69.54, -26.36) 09/25/2023   01:31:03  ( -69.59, -26.94)   23.42                72
 09/27/2023   16:07:48   ( -69.95, 114.17) 09/27/2023   16:08:30  ( -69.98, 114.21)    3.12                42
 09/27/2023   16:58:32   (  69.84, -78.35) 09/27/2023   16:57:57  (  69.86, -78.31)    3.14                35
 09/30/2023   07:34:11   (  70.58,  61.64) 09/30/2023   07:35:20  (  70.44,  63.13)   57.39                69
 09/30/2023   08:24:42   ( -69.91,-129.99) 09/30/2023   08:24:58  ( -69.90,-130.01)    1.30                16
 09/30/2023   09:15:26   (  69.80,  37.49) 09/30/2023   09:14:25  (  69.78,  37.47)    1.93                61