Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 6 14.  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)
 06/14/2023   07:09:16   ( -70.08,-111.24) 06/14/2023   07:10:14  ( -70.06,-111.27)    2.52                58
 06/14/2023   08:00:00   (  69.96,  56.25) 06/14/2023   07:59:41  (  69.96,  56.23)    0.76                19
 06/14/2023   08:50:30   ( -69.24,-135.38) 06/14/2023   08:49:21  ( -69.29,-137.04)   65.51                69
 06/16/2023   23:26:10   ( -70.04,   4.58) 06/16/2023   23:26:44  ( -70.05,   4.60)    1.17                34
 06/17/2023   00:16:54   (  69.93, 172.07) 06/17/2023   00:16:11  (  69.95, 172.10)    2.88                43
 06/19/2023   14:52:29   (  70.48, -47.64) 06/19/2023   14:53:40  (  70.35, -46.72)   37.05                71
 06/19/2023   15:43:04   ( -70.01, 120.40) 06/19/2023   15:43:14  ( -70.02, 120.44)    2.04                10
 06/19/2023   16:33:48   (  69.90, -72.13) 06/19/2023   16:32:41  (  69.92, -72.06)    3.04                67
 06/22/2023   07:09:15   (  70.09,  68.74) 06/22/2023   07:10:13  (  70.08,  68.77)    1.71                58
 06/22/2023   07:59:57   ( -69.99,-123.80) 06/22/2023   07:59:43  ( -69.97,-123.74)    2.93                14
 06/22/2023   08:50:29   (  69.24,  44.60) 06/22/2023   08:49:20  (  69.31,  43.00)   63.37                69
 06/24/2023   23:26:08   (  70.02,-175.39) 06/24/2023   23:26:43  (  70.00,-175.45)    2.91                35
 06/25/2023   00:16:50   ( -69.92,  -7.92) 06/25/2023   00:16:13  ( -69.90,  -7.96)    2.80                37
 06/27/2023   14:52:28   ( -70.64, 132.10) 06/27/2023   14:53:37  ( -70.51, 133.53)   54.72                69
 06/27/2023   15:43:02   (  70.01, -59.61) 06/27/2023   15:43:11  (  70.02, -59.54)    2.60                 9
 06/27/2023   16:33:43   ( -69.86, 107.94) 06/27/2023   16:32:42  ( -69.86, 107.87)    2.80                61