Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 7 27.  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)
 07/28/2023   07:34:11   (  70.03,  62.54) 07/28/2023   07:35:08  (  70.04,  62.54)    0.81                57
 07/28/2023   08:24:53   ( -69.94,-130.01) 07/28/2023   08:24:38  ( -69.92,-129.99)    2.34                15
 07/28/2023   09:15:25   (  69.19,  38.39) 07/28/2023   09:14:16  (  69.22,  36.70)   66.73                69
 07/30/2023   23:51:02   (  70.02, 178.34) 07/30/2023   23:51:39  (  70.03, 178.39)    2.14                37
 07/31/2023   00:41:44   ( -69.93, -14.20) 07/31/2023   00:41:09  ( -69.91, -14.13)    3.02                35
 08/02/2023   15:17:24   ( -70.85, 125.50) 08/02/2023   15:18:31  ( -70.79, 127.76)   82.86                67
 08/02/2023   16:07:53   (  69.96, -65.79) 08/02/2023   16:08:11  (  69.98, -65.79)    2.78                18
 08/02/2023   16:58:35   ( -69.86, 101.67) 08/02/2023   16:57:41  ( -69.87, 101.69)    1.08                54
 08/05/2023   07:34:03   ( -70.17,-117.63) 08/05/2023   07:35:14  ( -70.13,-117.35)   11.42                71
 08/05/2023   08:24:45   (  69.96,  49.99) 08/05/2023   08:24:42  (  69.97,  50.07)    3.07                 3
 08/05/2023   09:15:26   ( -69.81,-142.46) 08/05/2023   09:14:13  ( -69.81,-142.53)    2.50                73
 08/07/2023   23:50:52   ( -70.01,  -1.62) 08/07/2023   23:51:46  ( -70.04,  -1.60)    2.56                54
 08/08/2023   00:41:36   (  69.91, 165.85) 08/08/2023   00:41:13  (  69.93, 165.89)    2.48                23
 08/08/2023   01:32:04   ( -69.07, -25.62) 08/08/2023   01:30:56  ( -69.11, -27.58)   77.93                68
 08/10/2023   16:07:42   ( -69.97, 114.23) 08/10/2023   16:08:16  ( -69.97, 114.19)    1.54                34
 08/10/2023   16:58:26   (  69.87, -78.31) 08/10/2023   16:57:43  (  69.86, -78.32)    1.49                43