Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2025 9 18.  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)
 09/20/2025   14:03:41   (  71.03, -36.05) 09/20/2025   14:04:47  (  70.96, -33.47)   93.68                66
 09/20/2025   14:54:06   ( -70.06, 132.83) 09/20/2025   14:54:31  ( -70.09, 132.85)    2.62                25
 09/20/2025   15:44:50   (  69.94, -59.67) 09/20/2025   15:43:59  (  69.93, -59.72)    2.20                51
 09/23/2025   06:20:20   (  70.28,  80.96) 09/23/2025   06:21:31  (  70.20,  81.26)   14.51                71
 09/23/2025   07:10:59   ( -70.04,-111.36) 09/23/2025   07:11:02  ( -70.03,-111.34)    1.31                 3
 09/23/2025   08:01:42   (  69.87,  56.22) 09/23/2025   08:00:30  (  69.87,  56.08)    5.44                72
 09/25/2025   22:37:10   (  70.11,-163.00) 09/25/2025   22:38:02  (  70.13,-162.97)    2.30                52
 09/25/2025   23:27:52   ( -70.03,   4.44) 09/25/2025   23:27:32  ( -70.02,   4.51)    3.14                20
 09/26/2025   00:18:20   (  69.05, 173.17) 09/26/2025   00:17:13  (  69.14, 170.96)   87.82                67
 09/28/2025   14:54:02   (  70.10, -47.20) 09/28/2025   14:54:31  (  70.09, -47.14)    2.65                29
 09/28/2025   15:44:43   ( -69.97, 120.31) 09/28/2025   15:44:01  ( -69.99, 120.35)    2.12                42
 10/01/2025   06:20:18   ( -70.59, -99.50) 10/01/2025   06:21:28  ( -70.48, -98.34)   44.84                70
 10/01/2025   07:10:54   (  70.04,  68.66) 10/01/2025   07:11:01  (  70.03,  68.67)    0.97                 7
 10/01/2025   08:01:35   ( -69.92,-123.82) 10/01/2025   08:00:31  ( -69.93,-123.84)    2.10                64