Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 3 13.  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)
 03/15/2023   14:53:14   (  70.11, -47.10) 03/15/2023   14:54:14  (  70.12, -47.18)    2.97                60
 03/15/2023   15:43:56   ( -70.02, 120.35) 03/15/2023   15:43:44  ( -70.00, 120.29)    3.51                12
 03/15/2023   16:34:29   (  69.33, -71.32) 03/15/2023   16:33:20  (  69.40, -72.88)   61.97                69
 03/18/2023   07:10:06   (  70.12,  68.67) 03/18/2023   07:10:40  (  70.14,  68.73)    3.07                34
 03/18/2023   08:00:47   ( -69.97,-123.79) 03/18/2023   08:00:11  ( -69.97,-123.87)    2.95                36
 03/20/2023   22:36:24   ( -70.72,  16.19) 03/20/2023   22:37:33  ( -70.61,  17.65)   55.43                69
 03/20/2023   23:26:58   (  70.09,-175.51) 03/20/2023   23:27:08  (  70.06,-175.50)    3.29                10
 03/21/2023   00:17:39   ( -69.94,  -7.97) 03/21/2023   00:16:38  ( -69.95,  -8.02)    2.23                61
 03/23/2023   14:53:06   ( -70.18, 132.82) 03/23/2023   14:54:07  ( -70.16, 132.89)    3.03                61
 03/23/2023   15:43:49   (  70.02, -59.63) 03/23/2023   15:43:34  (  70.05, -59.63)    2.97                15
 03/23/2023   16:34:22   ( -69.45, 108.53) 03/23/2023   16:33:12  ( -69.50, 107.26)   50.12                70
 03/26/2023   07:09:57   ( -70.12,-111.32) 03/26/2023   07:10:33  ( -70.11,-111.29)    1.77                36
 03/26/2023   08:00:40   (  69.97,  56.22) 03/26/2023   08:00:00  (  69.99,  56.19)    2.77                40