Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 4 29.  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)
 04/29/2023   23:26:02   ( -70.14,   4.55) 04/29/2023   23:26:44  ( -70.14,   4.58)    1.34                42
 04/30/2023   00:16:46   (  70.02, 172.05) 04/30/2023   00:16:11  (  70.04, 172.08)    2.78                35
 05/02/2023   14:52:26   (  70.70, -47.89) 05/02/2023   14:53:35  (  70.61, -46.48)   52.70                69
 05/02/2023   15:42:58   ( -70.09, 120.39) 05/02/2023   15:43:13  ( -70.07, 120.35)    3.06                15
 05/02/2023   16:33:42   (  69.97, -72.11) 05/02/2023   16:32:40  (  69.96, -72.16)    1.89                62
 05/05/2023   07:09:12   (  70.19,  68.68) 05/05/2023   07:10:09  (  70.18,  68.76)    2.96                57
 05/05/2023   07:59:53   ( -70.05,-123.78) 05/05/2023   07:59:39  ( -70.07,-123.76)    2.71                14
 05/05/2023   08:50:25   (  69.29,  44.63) 05/05/2023   08:49:17  (  69.35,  42.90)   68.50                68
 05/07/2023   23:26:07   (  70.11,-175.44) 05/07/2023   23:26:37  (  70.10,-175.48)    1.85                30
 05/08/2023   00:16:49   ( -70.02,  -7.98) 05/08/2023   00:16:07  ( -69.99,  -7.99)    2.68                42
 05/10/2023   14:52:23   ( -70.42, 132.53) 05/10/2023   14:53:34  ( -70.33, 133.10)   23.19                71
 05/10/2023   15:43:03   (  70.10, -59.66) 05/10/2023   15:43:03  (  70.11, -59.58)    2.89                 0
 05/10/2023   16:33:44   ( -69.95, 107.88) 05/10/2023   16:32:34  ( -69.95, 107.83)    2.16                70