Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2025 9 15.  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   22:37:14   ( -70.11,  16.99) 09/17/2025   22:38:01  ( -70.10,  17.00)    0.53                47
 09/17/2025   23:27:58   (  69.99,-175.52) 09/17/2025   23:27:28  (  70.00,-175.50)    1.82                30
 09/20/2025   14:03:42   (  71.06, -36.08) 09/20/2025   14:04:48  (  70.95, -33.50)   94.30                66
 09/20/2025   14:54:07   ( -70.08, 132.81) 09/20/2025   14:54:32  ( -70.07, 132.83)    1.47                25
 09/20/2025   15:44:51   (  69.96, -59.70) 09/20/2025   15:43:59  (  69.97, -59.67)    1.29                52
 09/23/2025   06:20:19   (  70.25,  81.01) 09/23/2025   06:21:31  (  70.18,  81.24)   11.26                72
 09/23/2025   07:10:58   ( -70.01,-111.31) 09/23/2025   07:11:02  ( -70.02,-111.36)    2.55                 4
 09/23/2025   08:01:42   (  69.89,  56.19) 09/23/2025   08:00:29  (  69.91,  56.13)    3.64                73
 09/25/2025   22:37:10   (  70.13,-163.03) 09/25/2025   22:38:02  (  70.11,-162.98)    2.27                52
 09/25/2025   23:27:51   ( -69.99,   4.50) 09/25/2025   23:27:32  ( -70.01,   4.50)    1.68                19
 09/26/2025   00:18:20   (  69.07, 173.14) 09/26/2025   00:17:13  (  69.12, 170.95)   87.03                67
 09/28/2025   14:54:02   (  70.07, -47.15) 09/28/2025   14:54:32  (  70.08, -47.15)    1.77                30
 09/28/2025   15:44:44   ( -69.99, 120.29) 09/28/2025   15:44:02  ( -69.98, 120.34)    2.13                42