Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2025 9 17.  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)
 09/17/2025   23:27:58   (  69.99,-175.52) 09/17/2025   23:27:28  (  70.00,-175.50)    1.68                30
 09/20/2025   14:03:42   (  71.06, -36.08) 09/20/2025   14:04:48  (  70.94, -33.50)   94.21                66
 09/20/2025   14:54:07   ( -70.08, 132.80) 09/20/2025   14:54:32  ( -70.07, 132.82)    2.12                25
 09/20/2025   15:44:51   (  69.96, -59.70) 09/20/2025   15:43:59  (  69.96, -59.68)    1.08                52
 09/23/2025   06:20:19   (  70.25,  81.01) 09/23/2025   06:21:31  (  70.18,  81.23)   11.26                72
 09/23/2025   07:10:58   ( -70.01,-111.31) 09/23/2025   07:11:02  ( -70.01,-111.37)    2.46                 4
 09/23/2025   08:01:42   (  69.88,  56.19) 09/23/2025   08:00:29  (  69.91,  56.13)    3.57                73
 09/25/2025   22:37:10   (  70.12,-163.02) 09/25/2025   22:38:02  (  70.11,-163.00)    2.33                52
 09/25/2025   23:27:51   ( -69.99,   4.50) 09/25/2025   23:27:32  ( -70.00,   4.49)    0.73                19
 09/26/2025   00:18:20   (  69.07, 173.14) 09/26/2025   00:17:13  (  69.12, 170.94)   87.57                67
 09/28/2025   14:54:02   (  70.06, -47.14) 09/28/2025   14:54:32  (  70.07, -47.16)    1.40                30
 09/28/2025   15:44:44   ( -69.98, 120.29) 09/28/2025   15:44:02  ( -69.97, 120.32)    2.11                42
 10/01/2025   06:20:19   ( -70.60, -99.52) 10/01/2025   06:21:29  ( -70.46, -98.36)   45.46                70
 10/01/2025   07:10:55   (  70.05,  68.65) 10/01/2025   07:11:01  (  70.07,  68.72)    3.44                 6
 10/01/2025   08:01:36   ( -69.92,-123.84) 10/01/2025   08:00:32  ( -69.92,-123.87)    1.43                64