Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 4 5.  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)
 04/05/2023   22:36:09   ( -70.97,  15.81) 04/05/2023   22:37:16  ( -70.87,  18.05)   82.17                67
 04/05/2023   23:26:38   (  70.07,-175.44) 04/05/2023   23:26:56  (  70.06,-175.50)    2.61                18
 04/06/2023   00:17:20   ( -69.98,  -7.99) 04/06/2023   00:16:25  ( -70.00,  -7.95)    1.91                55
 04/08/2023   14:52:45   ( -70.18, 132.86) 04/08/2023   14:53:54  ( -70.17, 132.90)    1.87                69
 04/08/2023   15:43:28   (  70.07, -59.66) 04/08/2023   15:43:20  (  70.06, -59.60)    2.17                 8
 04/08/2023   16:34:05   ( -69.72, 108.19) 04/08/2023   16:32:53  ( -69.79, 107.64)   22.31                72
 04/11/2023   07:09:34   ( -70.13,-111.28) 04/11/2023   07:10:18  ( -70.15,-111.24)    1.91                44
 04/11/2023   08:00:18   (  70.03,  56.19) 04/11/2023   07:59:45  (  70.03,  56.25)    2.29                33
 04/13/2023   22:35:55   (  70.88,-164.00) 04/13/2023   22:37:03  (  70.74,-162.11)   70.79                68
 04/13/2023   23:26:24   ( -70.10,   4.56) 04/13/2023   23:26:43  ( -70.08,   4.56)    1.88                19
 04/14/2023   00:17:08   (  69.99, 172.03) 04/14/2023   00:16:10  (  69.97, 172.05)    2.90                58
 04/16/2023   14:52:32   (  70.17, -47.08) 04/16/2023   14:53:37  (  70.14, -47.09)    2.87                65
 04/16/2023   15:43:13   ( -70.02, 120.46) 04/16/2023   15:43:07  ( -70.04, 120.39)    3.10                 6
 04/16/2023   16:33:50   (  69.55, -71.53) 04/16/2023   16:32:39  (  69.64, -72.50)   39.47                71