Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 10 8.  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)
 10/08/2023   08:24:39   (  69.93,  49.99) 10/08/2023   08:25:06  (  69.90,  49.96)    2.85                27
 10/08/2023   09:15:20   ( -69.79,-142.49) 10/08/2023   09:14:36  ( -69.79,-142.56)    2.66                44
 10/10/2023   23:50:53   ( -70.28,  -2.09) 10/10/2023   23:52:05  ( -70.18,  -1.41)   28.16                72
 10/11/2023   00:41:32   (  69.90, 165.80) 10/11/2023   00:41:35  (  69.91, 165.85)    2.20                 3
 10/11/2023   01:32:13   ( -69.77, -26.68) 10/11/2023   01:31:06  ( -69.75, -26.74)    3.18                67
 10/13/2023   16:07:40   ( -69.96, 114.18) 10/13/2023   16:08:37  ( -69.98, 114.19)    2.68                57
 10/13/2023   16:58:24   (  69.84, -78.34) 10/13/2023   16:58:04  (  69.87, -78.32)    3.07                20
 10/13/2023   17:48:54   ( -69.12,  90.03) 10/13/2023   17:47:45  ( -69.16,  88.36)   66.27                69
 10/16/2023   08:24:31   ( -69.91,-129.96) 10/16/2023   08:25:05  ( -69.90,-130.04)    3.07                34
 10/16/2023   09:15:15   (  69.80,  37.51) 10/16/2023   09:14:32  (  69.78,  37.45)    2.85                43
 10/18/2023   23:50:47   (  70.29, 177.91) 10/18/2023   23:51:58  (  70.20, 178.65)   29.58                71
 10/19/2023   00:41:23   ( -69.88, -14.14) 10/19/2023   00:41:32  ( -69.88, -14.17)    1.50                 9
 10/19/2023   01:32:07   (  69.77, 153.33) 10/19/2023   01:30:59  (  69.76, 153.31)    1.60                68
 10/21/2023   16:07:33   (  69.96, -65.80) 10/21/2023   16:08:28  (  69.96, -65.79)    0.47                55
 10/21/2023   16:58:15   ( -69.86, 101.67) 10/21/2023   16:57:58  ( -69.86, 101.70)    1.18                17
 10/21/2023   17:48:45   (  69.01, -89.81) 10/21/2023   17:47:37  (  69.08, -91.70)   75.73                68