Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2025 12 6.  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)
 12/06/2025   22:37:14   ( -70.15,  16.97) 12/06/2025   22:38:04  ( -70.13,  17.01)    2.32                50
 12/06/2025   23:27:58   (  70.05,-175.57) 12/06/2025   23:27:31  (  70.03,-175.49)    3.69                27
 12/07/2025   00:18:23   ( -69.04,  -6.78) 12/07/2025   00:17:16  ( -69.09,  -9.12)   93.28                67
 12/09/2025   14:03:45   (  70.97, -35.91) 12/09/2025   14:04:52  (  70.89, -33.62)   83.89                67
 12/09/2025   14:54:12   ( -70.06, 132.86) 12/09/2025   14:54:35  ( -70.07, 132.80)    2.33                23
 12/09/2025   15:44:56   (  69.97, -59.69) 12/09/2025   15:44:02  (  69.96, -59.70)    1.07                54
 12/12/2025   06:20:28   (  70.17,  81.14) 12/12/2025   06:21:33  (  70.18,  81.21)    3.00                65
 12/12/2025   07:11:10   ( -70.05,-111.35) 12/12/2025   07:11:04  ( -70.02,-111.39)    2.99                 6
 12/12/2025   08:01:47   (  69.59,  56.64) 12/12/2025   08:00:36  (  69.64,  55.72)   36.04                71
 12/14/2025   22:37:26   (  70.11,-163.01) 12/14/2025   22:38:03  (  70.10,-163.04)    2.23                37
 12/14/2025   23:28:08   ( -69.98,   4.50) 12/14/2025   23:27:33  ( -69.99,   4.45)    2.03                35
 12/17/2025   14:03:48   ( -70.57, 144.73) 12/17/2025   14:04:59  ( -70.46, 145.74)   39.22                71
 12/17/2025   14:54:24   (  70.07, -47.18) 12/17/2025   14:54:31  (  70.08, -47.18)    1.04                 7
 12/17/2025   15:45:07   ( -69.99, 120.25) 12/17/2025   15:44:01  ( -69.97, 120.31)    2.66                66
 12/20/2025   06:20:39   ( -70.16, -98.87) 12/20/2025   06:21:32  ( -70.14, -98.85)    2.74                53
 12/20/2025   07:11:22   (  70.03,  68.63) 12/20/2025   07:10:59  (  70.02,  68.63)    1.44                23