Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 5 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)
 05/15/2023   22:35:43   (  70.99,-164.19) 05/15/2023   22:36:50  (  70.84,-162.03)   80.53                67
 05/15/2023   23:26:10   ( -70.12,   4.52) 05/15/2023   23:26:31  ( -70.12,   4.55)    1.10                21
 05/16/2023   00:16:54   (  69.99, 172.02) 05/16/2023   00:15:58  (  70.02, 172.05)    2.84                56
 05/18/2023   14:52:24   (  70.20, -47.15) 05/18/2023   14:53:29  (  70.19, -47.11)    1.96                65
 05/18/2023   15:43:05   ( -70.06, 120.37) 05/18/2023   15:42:59  ( -70.08, 120.37)    1.82                 6
 05/18/2023   16:33:43   (  69.62, -71.66) 05/18/2023   16:32:32  (  69.64, -72.60)   36.38                71
 05/21/2023   07:09:19   (  70.15,  68.68) 05/21/2023   07:09:56  (  70.16,  68.73)    2.34                37
 05/21/2023   08:00:00   ( -70.01,-123.79) 05/21/2023   07:59:27  ( -70.00,-123.86)    3.19                33
 05/23/2023   22:35:38   ( -70.70,  16.27) 05/23/2023   22:36:48  ( -70.60,  17.61)   50.68                70
 05/23/2023   23:26:13   (  70.11,-175.49) 05/23/2023   23:26:22  (  70.10,-175.46)    1.44                 9
 05/24/2023   00:16:55   ( -70.02,  -8.04) 05/24/2023   00:15:52  ( -70.00,  -7.98)    3.37                63
 05/26/2023   14:52:24   ( -70.19, 132.84) 05/26/2023   14:53:21  ( -70.19, 132.89)    2.37                57
 05/26/2023   15:43:08   (  70.08, -59.68) 05/26/2023   15:42:48  (  70.07, -59.63)    2.64                20