Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2025 9 11.  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)
 09/12/2025   14:03:40   ( -70.80, 144.34) 09/12/2025   14:04:48  ( -70.72, 146.16)   67.37                68
 09/12/2025   14:54:12   (  70.05, -47.18) 09/12/2025   14:54:25  (  70.07, -47.14)    2.54                13
 09/12/2025   15:44:54   ( -69.96, 120.28) 09/12/2025   15:43:55  ( -69.96, 120.33)    2.10                59
 09/15/2025   06:20:21   ( -70.13, -98.83) 09/15/2025   06:21:30  ( -70.13, -98.83)    0.29                69
 09/15/2025   07:11:05   (  70.02,  68.66) 09/15/2025   07:10:57  (  70.03,  68.67)    1.41                 8
 09/15/2025   08:01:43   ( -69.72,-123.58) 09/15/2025   08:00:30  ( -69.75,-124.08)   20.00                73
 09/17/2025   22:37:14   ( -70.10,  17.00) 09/17/2025   22:38:02  ( -70.08,  16.97)    2.08                48
 09/17/2025   23:27:58   (  69.98,-175.52) 09/17/2025   23:27:29  (  69.98,-175.54)    1.06                29
 09/20/2025   14:03:43   (  71.10, -36.16) 09/20/2025   14:04:48  (  71.00, -33.41)   99.93                65
 09/20/2025   14:54:07   ( -70.07, 132.82) 09/20/2025   14:54:33  ( -70.08, 132.84)    1.37                26
 09/20/2025   15:44:51   (  69.95, -59.69) 09/20/2025   15:44:00  (  69.97, -59.67)    2.17                51
 09/23/2025   06:20:20   (  70.29,  80.94) 09/23/2025   06:21:32  (  70.23,  81.29)   15.02                72
 09/23/2025   07:10:59   ( -70.05,-111.36) 09/23/2025   07:11:04  ( -70.02,-111.37)    3.46                 5
 09/23/2025   08:01:43   (  69.93,  56.12) 09/23/2025   08:00:31  (  69.90,  56.11)    2.84                72