Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 9 13.  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)
 09/14/2023   07:34:15   (  70.80,  61.30) 09/14/2023   07:35:22  (  70.69,  63.46)   80.03                67
 09/14/2023   08:24:42   ( -69.94,-130.01) 09/14/2023   08:25:04  ( -69.92,-130.03)    2.37                22
 09/14/2023   09:15:26   (  69.81,  37.49) 09/14/2023   09:14:31  (  69.82,  37.47)    1.18                55
 09/16/2023   23:50:55   (  69.98, 178.37) 09/16/2023   23:52:04  (  69.99, 178.32)    2.21                69
 09/17/2023   00:41:37   ( -69.90, -14.19) 09/17/2023   00:41:34  ( -69.88, -14.20)    2.12                 3
 09/17/2023   01:32:16   (  69.51, 153.69) 09/17/2023   01:31:04  (  69.61, 153.07)   26.69                72
 09/19/2023   16:07:49   (  69.96, -65.83) 09/19/2023   16:08:32  (  69.97, -65.82)    1.74                43
 09/19/2023   16:58:31   ( -69.87, 101.61) 09/19/2023   16:58:02  ( -69.87, 101.66)    2.00                29
 09/22/2023   07:34:14   ( -70.80,-118.69) 09/22/2023   07:35:22  ( -70.69,-116.54)   79.97                68
 09/22/2023   08:24:44   (  69.94,  49.96) 09/22/2023   08:25:01  (  69.92,  49.99)    2.95                17
 09/22/2023   09:15:25   ( -69.80,-142.51) 09/22/2023   09:14:31  ( -69.81,-142.52)    1.32                54
 09/24/2023   23:50:54   ( -70.00,  -1.67) 09/24/2023   23:52:02  ( -70.00,  -1.65)    0.64                68
 09/25/2023   00:41:38   (  69.88, 165.82) 09/25/2023   00:41:29  (  69.88, 165.83)    0.65                 9
 09/25/2023   01:32:15   ( -69.53, -26.35) 09/25/2023   01:31:03  ( -69.56, -26.98)   24.77                72