Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 8 15.  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)
 08/15/2023   23:50:42   (  70.04, 178.37) 08/15/2023   23:51:44  (  70.04, 178.43)    1.96                62
 08/16/2023   00:41:23   ( -69.90, -14.10) 08/16/2023   00:41:14  ( -69.92, -14.11)    2.04                 9
 08/16/2023   01:31:59   (  69.36, 154.00) 08/16/2023   01:30:48  (  69.44, 152.87)   44.85                71
 08/18/2023   16:07:32   (  69.98, -65.74) 08/18/2023   16:08:13  (  70.00, -65.75)    2.64                41
 08/18/2023   16:58:14   ( -69.89, 101.71) 08/18/2023   16:57:43  ( -69.88, 101.72)    0.85                31
 08/21/2023   07:33:55   ( -70.92,-118.76) 08/21/2023   07:35:01  ( -70.80,-116.32)   89.95                66
 08/21/2023   08:24:23   (  69.97,  50.05) 08/21/2023   08:24:41  (  69.99,  50.12)    3.33                18
 08/21/2023   09:15:04   ( -69.83,-142.42) 08/21/2023   09:14:12  ( -69.82,-142.47)    2.38                52
 08/23/2023   23:50:29   ( -70.08,  -1.64) 08/23/2023   23:51:41  ( -70.06,  -1.53)    4.80                72
 08/24/2023   00:41:12   (  69.92, 165.92) 08/24/2023   00:41:09  (  69.89, 165.88)    3.12                 3
 08/24/2023   01:31:52   ( -69.72, -26.47) 08/24/2023   01:30:40  ( -69.73, -26.71)    9.05                72
 08/26/2023   16:07:18   ( -69.98, 114.30) 08/26/2023   16:08:09  ( -70.00, 114.28)    1.96                51
 08/26/2023   16:58:02   (  69.87, -78.23) 08/26/2023   16:57:36  (  69.88, -78.24)    0.96                26