Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2025 12 7.  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)
 12/09/2025   14:03:45   (  70.98, -35.93) 12/09/2025   14:04:52  (  70.88, -33.63)   84.24                67
 12/09/2025   14:54:12   ( -70.08, 132.84) 12/09/2025   14:54:35  ( -70.06, 132.78)    2.90                23
 12/09/2025   15:44:56   (  69.98, -59.71) 12/09/2025   15:44:02  (  69.96, -59.72)    3.05                54
 12/12/2025   06:20:29   (  70.18,  81.13) 12/12/2025   06:21:34  (  70.18,  81.20)    2.92                65
 12/12/2025   07:11:11   ( -70.05,-111.37) 12/12/2025   07:11:04  ( -70.07,-111.32)    2.84                 7
 12/12/2025   08:01:48   (  69.59,  56.63) 12/12/2025   08:00:37  (  69.64,  55.72)   35.57                71
 12/14/2025   22:37:26   (  70.12,-163.02) 12/14/2025   22:38:03  (  70.10,-163.03)    1.61                37
 12/14/2025   23:28:08   ( -69.99,   4.49) 12/14/2025   23:27:33  ( -70.00,   4.46)    1.53                35
 12/17/2025   14:03:49   ( -70.62, 144.64) 12/17/2025   14:04:59  ( -70.48, 145.76)   44.28                70
 12/17/2025   14:54:24   (  70.07, -47.18) 12/17/2025   14:54:32  (  70.04, -47.23)    3.13                 8
 12/17/2025   15:45:06   ( -69.94, 120.33) 12/17/2025   15:44:02  ( -69.94, 120.26)    2.80                64
 12/20/2025   06:20:39   ( -70.16, -98.87) 12/20/2025   06:21:32  ( -70.17, -98.80)    3.22                53
 12/20/2025   07:11:22   (  70.03,  68.64) 12/20/2025   07:11:00  (  70.00,  68.60)    3.01                22