Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 9 16.  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)
 09/16/2023   23:50:55   (  69.98, 178.37) 09/16/2023   23:52:04  (  70.00, 178.33)    2.57                69
 09/17/2023   00:41:37   ( -69.90, -14.20) 09/17/2023   00:41:34  ( -69.89, -14.20)    1.97                 3
 09/17/2023   01:32:16   (  69.51, 153.69) 09/17/2023   01:31:04  (  69.62, 153.08)   26.79                72
 09/19/2023   16:07:50   (  69.96, -65.83) 09/19/2023   16:08:34  (  69.94, -65.88)    2.84                44
 09/19/2023   16:58:32   ( -69.88, 101.61) 09/19/2023   16:58:03  ( -69.88, 101.68)    2.75                29
 09/22/2023   07:34:15   ( -70.85,-118.78) 09/22/2023   07:35:22  ( -70.72,-116.49)   85.00                67
 09/22/2023   08:24:44   (  69.94,  49.96) 09/22/2023   08:25:01  (  69.95,  50.03)    3.04                17
 09/22/2023   09:15:25   ( -69.81,-142.52) 09/22/2023   09:14:32  ( -69.79,-142.56)    2.21                53
 09/24/2023   23:50:54   ( -70.00,  -1.67) 09/24/2023   23:52:03  ( -70.00,  -1.66)    0.71                69
 09/25/2023   00:41:38   (  69.88, 165.82) 09/25/2023   00:41:30  (  69.88, 165.83)    0.38                 8
 09/25/2023   01:32:16   ( -69.59, -26.43) 09/25/2023   01:31:03  ( -69.62, -26.91)   19.13                73
 09/27/2023   16:07:48   ( -69.95, 114.18) 09/27/2023   16:08:31  ( -69.95, 114.17)    0.42                43
 09/27/2023   16:58:32   (  69.84, -78.34) 09/27/2023   16:57:58  (  69.84, -78.35)    0.14                34