Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 8 28.  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)
 08/29/2023   07:34:07   (  70.70,  61.51) 08/29/2023   07:35:15  (  70.58,  63.30)   67.60                68
 08/29/2023   08:24:36   ( -69.94,-129.97) 08/29/2023   08:24:54  ( -69.97,-129.95)    3.09                18
 08/29/2023   09:15:20   (  69.81,  37.53) 08/29/2023   09:14:22  (  69.81,  37.48)    1.76                58
 08/31/2023   23:50:50   (  69.99, 178.40) 08/31/2023   23:51:56  (  69.99, 178.33)    2.79                66
 09/01/2023   00:41:32   ( -69.91, -14.16) 09/01/2023   00:41:25  ( -69.93, -14.12)    3.05                 7
 09/01/2023   01:32:09   (  69.41, 153.88) 09/01/2023   01:30:58  (  69.50, 152.93)   38.29                71
 09/03/2023   16:07:46   (  69.96, -65.80) 09/03/2023   16:08:26  (  69.98, -65.81)    1.55                40
 09/03/2023   16:58:28   ( -69.88, 101.64) 09/03/2023   16:57:56  ( -69.87, 101.68)    1.66                32
 09/06/2023   07:34:10   ( -70.75,-118.58) 09/06/2023   07:35:18  ( -70.60,-116.66)   72.61                68
 09/06/2023   08:24:41   (  69.95,  49.99) 09/06/2023   08:24:55  (  69.95,  50.03)    1.77                14
 09/06/2023   09:15:22   ( -69.81,-142.49) 09/06/2023   09:14:26  ( -69.79,-142.55)    3.34                56
 09/08/2023   23:50:52   ( -70.00,  -1.64) 09/08/2023   23:51:58  ( -70.01,  -1.64)    0.78                66
 09/09/2023   00:41:36   (  69.88, 165.85) 09/09/2023   00:41:25  (  69.89, 165.84)    1.13                11
 09/09/2023   01:32:12   ( -69.48, -26.24) 09/09/2023   01:31:00  ( -69.52, -27.04)   31.52                72
 09/11/2023   16:07:47   ( -69.94, 114.21) 09/11/2023   16:08:28  ( -69.93, 114.14)    2.92                41
 09/11/2023   16:58:31   (  69.83, -78.30) 09/11/2023   16:57:55  (  69.82, -78.38)    3.05                36