Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 4 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)
 05/02/2023   14:52:25   (  70.67, -47.85) 05/02/2023   14:53:35  (  70.58, -46.54)   49.48                70
 05/02/2023   15:42:57   ( -70.06, 120.43) 05/02/2023   15:43:12  ( -70.08, 120.37)    2.90                15
 05/02/2023   16:33:42   (  69.99, -72.15) 05/02/2023   16:32:39  (  69.97, -72.13)    2.30                63
 05/05/2023   07:09:12   (  70.15,  68.74) 05/05/2023   07:10:10  (  70.14,  68.70)    2.20                58
 05/05/2023   07:59:54   ( -70.06,-123.81) 05/05/2023   07:59:39  ( -70.08,-123.75)    3.24                15
 05/05/2023   08:50:26   (  69.30,  44.61) 05/05/2023   08:49:17  (  69.36,  42.92)   66.76                69
 05/07/2023   23:26:08   (  70.11,-175.44) 05/07/2023   23:26:37  (  70.11,-175.46)    0.70                29
 05/08/2023   00:16:50   ( -70.02,  -7.98) 05/08/2023   00:16:07  ( -70.01,  -7.97)    1.59                43
 05/10/2023   14:52:22   ( -70.35, 132.64) 05/10/2023   14:53:34  ( -70.29, 133.03)   16.22                72
 05/10/2023   15:43:03   (  70.08, -59.63) 05/10/2023   15:43:03  (  70.06, -59.64)    1.68                 0
 05/10/2023   16:33:45   ( -69.98, 107.83) 05/10/2023   16:32:33  ( -69.96, 107.84)    2.93                72
 05/13/2023   07:09:15   ( -70.17,-111.31) 05/13/2023   07:10:02  ( -70.16,-111.26)    1.94                47
 05/13/2023   07:59:59   (  70.05,  56.17) 05/13/2023   07:59:29  (  70.04,  56.22)    2.15                30