Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 6 10.  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)
 06/11/2023   14:52:28   ( -70.41, 132.48) 06/11/2023   14:53:40  ( -70.29, 133.17)   29.47                72
 06/11/2023   15:43:07   (  70.03, -59.62) 06/11/2023   15:43:10  (  70.02, -59.56)    2.48                 3
 06/11/2023   16:33:48   ( -69.89, 107.90) 06/11/2023   16:32:40  ( -69.91, 107.92)    2.37                68
 06/14/2023   07:09:17   ( -70.10,-111.28) 06/14/2023   07:10:14  ( -70.08,-111.24)    2.93                57
 06/14/2023   08:00:01   (  69.99,  56.20) 06/14/2023   07:59:41  (  69.98,  56.26)    2.47                20
 06/14/2023   08:50:31   ( -69.26,-135.42) 06/14/2023   08:49:21  ( -69.32,-137.01)   62.58                70
 06/16/2023   23:26:10   ( -70.02,   4.62) 06/16/2023   23:26:45  ( -70.02,   4.56)    2.48                35
 06/17/2023   00:16:54   (  69.91, 172.10) 06/17/2023   00:16:12  (  69.91, 172.05)    1.99                42
 06/19/2023   14:52:29   (  70.51, -47.69) 06/19/2023   14:53:39  (  70.37, -46.69)   40.42                70
 06/19/2023   15:43:03   ( -69.99, 120.43) 06/19/2023   15:43:14  ( -69.99, 120.39)    1.39                11
 06/19/2023   16:33:47   (  69.88, -72.10) 06/19/2023   16:32:41  (  69.88, -72.12)    0.76                66
 06/22/2023   07:09:15   (  70.07,  68.76) 06/22/2023   07:10:13  (  70.09,  68.79)    2.64                58
 06/22/2023   07:59:57   ( -69.97,-123.77) 06/22/2023   07:59:43  ( -69.99,-123.72)    2.86                14
 06/22/2023   08:50:29   (  69.23,  44.62) 06/22/2023   08:49:20  (  69.32,  43.02)   64.05                69