Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 7 25.  Predictions up to the next  14.0 days:

     Date     Time(NOAA-21) NOAA-21 Lat/Lon Date Time(LANDSAT-8) LANDSAT-8 Lat/Lon    Distance(km)  Time Diff(sec)
 07/26/2023   23:25:48   (  70.23,-175.65) 07/26/2023   23:27:00  (  70.15,-175.26)   16.93                72
 07/27/2023   00:16:26   ( -69.93,  -7.87) 07/27/2023   00:16:32  ( -69.93,  -7.93)    2.76                 6
 07/27/2023   01:07:10   (  69.81, 159.61) 07/27/2023   01:05:59  (  69.83, 159.57)    2.43                71
 07/29/2023   15:42:37   (  70.05, -59.60) 07/29/2023   15:43:33  (  70.04, -59.55)    2.38                56
 07/29/2023   16:33:18   ( -69.90, 107.94) 07/29/2023   16:33:03  ( -69.93, 107.94)    3.19                15
 07/29/2023   17:23:50   (  69.16, -83.67) 07/29/2023   17:22:41  (  69.22, -85.39)   68.22                69
 08/01/2023   07:59:28   (  69.99,  56.28) 08/01/2023   08:00:04  (  70.01,  56.29)    2.41                36
 08/01/2023   08:50:10   ( -69.89,-136.25) 08/01/2023   08:49:34  ( -69.90,-136.22)    2.14                36
 08/03/2023   23:25:49   ( -70.76,   3.53) 08/03/2023   23:26:57  ( -70.67,   5.49)   72.86                68
 08/04/2023   00:16:20   (  69.98, 172.07) 08/04/2023   00:16:35  (  69.95, 172.09)    3.32                15
 08/04/2023   01:07:00   ( -69.83, -20.38) 08/04/2023   01:06:04  ( -69.85, -20.41)    2.87                56
 08/06/2023   15:42:26   ( -70.03, 120.47) 08/06/2023   15:43:37  ( -70.04, 120.46)    1.69                71
 08/06/2023   16:33:10   (  69.93, -72.07) 08/06/2023   16:33:04  (  69.93, -72.06)    0.61                 6
 08/06/2023   17:23:49   ( -69.67,  95.63) 08/06/2023   17:22:36  ( -69.72,  95.29)   14.42                73