Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 6 9.  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, 132.47) 06/11/2023   14:53:40  ( -70.28, 133.17)   29.67                72
 06/11/2023   15:43:07   (  70.03, -59.63) 06/11/2023   15:43:10  (  70.02, -59.56)    2.74                 3
 06/11/2023   16:33:48   ( -69.89, 107.90) 06/11/2023   16:32:40  ( -69.91, 107.91)    1.98                68
 06/14/2023   07:09:16   ( -70.06,-111.21) 06/14/2023   07:10:14  ( -70.08,-111.24)    3.04                58
 06/14/2023   08:00:01   (  69.99,  56.19) 06/14/2023   07:59:41  (  69.97,  56.25)    3.13                20
 06/14/2023   08:50:31   ( -69.27,-135.43) 06/14/2023   08:49:21  ( -69.32,-137.01)   62.48                70
 06/16/2023   23:26:10   ( -70.02,   4.61) 06/16/2023   23:26:45  ( -70.02,   4.55)    2.56                35
 06/17/2023   00:16:54   (  69.91, 172.09) 06/17/2023   00:16:12  (  69.91, 172.04)    1.90                42
 06/19/2023   14:52:28   (  70.47, -47.63) 06/19/2023   14:53:39  (  70.36, -46.71)   36.32                71
 06/19/2023   15:43:03   ( -70.00, 120.42) 06/19/2023   15:43:14  ( -69.98, 120.38)    2.39                11
 06/19/2023   16:33:47   (  69.89, -72.11) 06/19/2023   16:32:41  (  69.87, -72.13)    2.70                66
 06/22/2023   07:09:15   (  70.08,  68.74) 06/22/2023   07:10:13  (  70.08,  68.77)    1.45                58
 06/22/2023   07:59:57   ( -69.98,-123.79) 06/22/2023   07:59:43  ( -69.98,-123.74)    1.96                14
 06/22/2023   08:50:29   (  69.24,  44.60) 06/22/2023   08:49:20  (  69.31,  43.00)   63.53                69