Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2025 9 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)
 09/15/2025   06:20:21   ( -70.12, -98.82) 09/15/2025   06:21:30  ( -70.13, -98.84)    1.09                69
 09/15/2025   07:11:05   (  70.01,  68.67) 09/15/2025   07:10:57  (  70.03,  68.67)    2.60                 8
 09/15/2025   08:01:43   ( -69.71,-123.57) 09/15/2025   08:00:30  ( -69.75,-124.09)   20.64                73
 09/17/2025   22:37:14   ( -70.09,  17.01) 09/17/2025   22:38:01  ( -70.12,  17.03)    3.37                47
 09/17/2025   23:27:58   (  69.97,-175.50) 09/17/2025   23:27:29  (  69.96,-175.55)    2.29                29
 09/20/2025   14:03:41   (  71.04, -36.06) 09/20/2025   14:04:47  (  70.97, -33.46)   94.45                66
 09/20/2025   14:54:06   ( -70.07, 132.83) 09/20/2025   14:54:32  ( -70.04, 132.79)    2.78                26
 09/20/2025   15:44:50   (  69.95, -59.68) 09/20/2025   15:43:59  (  69.94, -59.71)    1.64                51
 09/23/2025   06:20:20   (  70.29,  80.95) 09/23/2025   06:21:31  (  70.22,  81.29)   14.68                71
 09/23/2025   07:10:59   ( -70.04,-111.36) 09/23/2025   07:11:02  ( -70.06,-111.31)    2.77                 3
 09/23/2025   08:01:43   (  69.92,  56.13) 09/23/2025   08:00:30  (  69.90,  56.11)    3.28                73
 09/25/2025   22:37:10   (  70.11,-163.00) 09/25/2025   22:38:03  (  70.11,-162.99)    0.28                53
 09/25/2025   23:27:52   ( -70.03,   4.45) 09/25/2025   23:27:33  ( -70.01,   4.50)    2.86                19
 09/26/2025   00:18:21   (  69.11, 173.09) 09/26/2025   00:17:14  (  69.12, 170.94)   85.09                67