Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 9 22.  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)
 09/22/2023   07:34:15   ( -70.85,-118.78) 09/22/2023   07:35:22  ( -70.70,-116.52)   84.39                67
 09/22/2023   08:24:44   (  69.93,  49.97) 09/22/2023   08:25:01  (  69.95,  50.02)    2.40                17
 09/22/2023   09:15:25   ( -69.80,-142.51) 09/22/2023   09:14:31  ( -69.83,-142.50)    3.24                54
 09/24/2023   23:50:54   ( -70.00,  -1.67) 09/24/2023   23:52:02  ( -70.02,  -1.63)    2.59                68
 09/25/2023   00:41:38   (  69.88, 165.82) 09/25/2023   00:41:30  (  69.86, 165.79)    2.50                 8
 09/25/2023   01:32:15   ( -69.54, -26.35) 09/25/2023   01:31:03  ( -69.58, -26.95)   24.03                72
 09/27/2023   16:07:48   ( -69.96, 114.17) 09/27/2023   16:08:30  ( -69.96, 114.18)    0.36                42
 09/27/2023   16:58:32   (  69.84, -78.34) 09/27/2023   16:57:57  (  69.85, -78.33)    1.16                35
 09/30/2023   07:34:09   (  70.54,  61.72) 09/30/2023   07:35:18  (  70.46,  63.16)   54.28                69
 09/30/2023   08:24:41   ( -69.92,-130.01) 09/30/2023   08:24:56  ( -69.91,-129.99)    1.36                15
 09/30/2023   09:15:25   (  69.81,  37.47) 09/30/2023   09:14:23  (  69.80,  37.49)    1.18                62
 10/02/2023   23:50:53   (  69.99, 178.34) 10/02/2023   23:51:52  (  69.99, 178.38)    1.51                59
 10/03/2023   00:41:35   ( -69.90, -14.20) 10/03/2023   00:41:22  ( -69.89, -14.13)    3.16                13
 10/03/2023   01:32:08   (  69.20, 154.12) 10/03/2023   01:30:58  (  69.27, 152.68)   57.20                70
 10/05/2023   16:07:46   (  69.93, -65.79) 10/05/2023   16:08:18  (  69.92, -65.81)    0.91                32
 10/05/2023   16:58:28   ( -69.84, 101.67) 10/05/2023   16:57:48  ( -69.82, 101.68)    1.40                40