Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 5 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)
 05/29/2023   07:09:18   ( -70.11,-111.27) 05/29/2023   07:10:05  ( -70.10,-111.20)    2.81                47
 05/29/2023   08:00:02   (  69.99,  56.23) 05/29/2023   07:59:32  (  70.00,  56.30)    3.51                30
 05/31/2023   22:35:46   (  70.96,-164.19) 05/31/2023   22:36:52  (  70.87,-161.82)   86.82                66
 05/31/2023   23:26:12   ( -70.04,   4.61) 05/31/2023   23:26:35  ( -70.04,   4.60)    0.92                23
 06/01/2023   00:16:56   (  69.91, 172.10) 06/01/2023   00:16:02  (  69.94, 172.09)    2.93                54
 06/03/2023   14:52:24   (  70.11, -47.05) 06/03/2023   14:53:33  (  70.13, -47.03)    2.27                69
 06/03/2023   15:43:06   ( -70.02, 120.40) 06/03/2023   15:43:03  ( -70.02, 120.45)    1.83                 3
 06/03/2023   16:33:46   (  69.69, -71.80) 06/03/2023   16:32:33  (  69.74, -72.29)   19.86                73
 06/06/2023   07:09:18   (  70.05,  68.80) 06/06/2023   07:10:02  (  70.08,  68.79)    3.20                44
 06/06/2023   08:00:00   ( -69.96,-123.74) 06/06/2023   07:59:32  ( -69.97,-123.73)    1.44                28
 06/08/2023   22:35:44   ( -70.95,  15.83) 06/08/2023   22:36:51  ( -70.83,  18.15)   85.22                67
 06/08/2023   23:26:12   (  70.00,-175.35) 06/08/2023   23:26:31  (  70.01,-175.42)    2.92                19
 06/09/2023   00:16:54   ( -69.90,  -7.89) 06/09/2023   00:16:01  ( -69.90,  -7.93)    1.72                53
 06/11/2023   14:52:23   ( -70.11, 132.94) 06/11/2023   14:53:32  ( -70.09, 132.94)    2.64                69
 06/11/2023   15:43:06   (  69.95, -59.51) 06/11/2023   15:42:59  (  69.97, -59.58)    3.31                 7
 06/11/2023   16:33:44   ( -69.64, 108.26) 06/11/2023   16:32:32  ( -69.71, 107.68)   23.46                72