Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 5 30.  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)
 05/31/2023   22:35:46   (  70.96,-164.19) 05/31/2023   22:36:52  (  70.86,-161.82)   86.88                66
 05/31/2023   23:26:12   ( -70.04,   4.60) 05/31/2023   23:26:35  ( -70.04,   4.59)    0.45                23
 06/01/2023   00:16:56   (  69.92, 172.10) 06/01/2023   00:16:02  (  69.94, 172.09)    2.41                54
 06/03/2023   14:52:24   (  70.11, -47.05) 06/03/2023   14:53:33  (  70.13, -47.03)    2.11                69
 06/03/2023   15:43:06   ( -70.02, 120.40) 06/03/2023   15:43:03  ( -70.01, 120.44)    1.93                 3
 06/03/2023   16:33:46   (  69.69, -71.80) 06/03/2023   16:32:33  (  69.74, -72.29)   19.83                73
 06/06/2023   07:09:19   (  70.10,  68.73) 06/06/2023   07:10:02  (  70.08,  68.79)    3.38                43
 06/06/2023   08:00:00   ( -69.96,-123.74) 06/06/2023   07:59:32  ( -69.97,-123.73)    1.57                28
 06/08/2023   22:35:44   ( -70.94,  15.84) 06/08/2023   22:36:51  ( -70.83,  18.15)   85.09                67
 06/08/2023   23:26:12   (  69.99,-175.34) 06/08/2023   23:26:31  (  70.01,-175.41)    3.50                19
 06/09/2023   00:16:54   ( -69.90,  -7.88) 06/09/2023   00:16:01  ( -69.91,  -7.93)    1.97                53
 06/11/2023   14:52:23   ( -70.10, 132.95) 06/11/2023   14:53:32  ( -70.10, 132.95)    0.88                69
 06/11/2023   15:43:07   (  70.00, -59.58) 06/11/2023   15:42:59  (  69.98, -59.56)    1.74                 8
 06/11/2023   16:33:44   ( -69.64, 108.27) 06/11/2023   16:32:32  ( -69.71, 107.69)   24.03                72