Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 9 20.  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   ( -70.82,-118.73) 09/22/2023   07:35:22  ( -70.73,-116.47)   83.20                67
 09/22/2023   08:24:44   (  69.90,  50.02) 09/22/2023   08:25:02  (  69.92,  49.99)    2.17                18
 09/22/2023   09:15:26   ( -69.83,-142.55) 09/22/2023   09:14:32  ( -69.81,-142.54)    1.93                54
 09/24/2023   23:50:53   ( -69.97,  -1.62) 09/24/2023   23:52:02  ( -70.00,  -1.66)    3.00                69
 09/25/2023   00:41:38   (  69.90, 165.79) 09/25/2023   00:41:29  (  69.89, 165.83)    2.31                 9
 09/25/2023   01:32:15   ( -69.56, -26.38) 09/25/2023   01:31:02  ( -69.61, -26.91)   21.61                73
 09/27/2023   16:07:47   ( -69.93, 114.22) 09/27/2023   16:08:30  ( -69.93, 114.14)    3.04                43
 09/27/2023   16:58:31   (  69.81, -78.30) 09/27/2023   16:57:57  (  69.82, -78.37)    3.24                34
 09/30/2023   07:34:10   (  70.56,  61.69) 09/30/2023   07:35:19  (  70.43,  63.11)   55.09                69
 09/30/2023   08:24:41   ( -69.89,-129.96) 09/30/2023   08:24:57  ( -69.88,-130.03)    2.86                16
 09/30/2023   09:15:25   (  69.77,  37.52) 09/30/2023   09:14:24  (  69.77,  37.45)    2.84                61
 10/02/2023   23:50:53   (  69.96, 178.39) 10/02/2023   23:51:53  (  69.96, 178.33)    2.25                60
 10/03/2023   00:41:35   ( -69.86, -14.15) 10/03/2023   00:41:23  ( -69.85, -14.17)    1.31                12
 10/03/2023   01:32:08   (  69.17, 154.17) 10/03/2023   01:30:59  (  69.24, 152.64)   60.90                69