Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2025 10 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)
 10/19/2025   22:36:47   ( -70.54,  16.46) 10/19/2025   22:37:58  ( -70.41,  17.44)   39.39                71
 10/19/2025   23:27:24   (  70.03,-175.43) 10/19/2025   23:27:30  (  70.03,-175.46)    1.19                 6
 10/20/2025   00:18:05   ( -69.92,  -7.95) 10/20/2025   00:17:00  ( -69.92,  -7.99)    1.33                65
 10/22/2025   14:53:29   ( -70.12, 132.91) 10/22/2025   14:54:29  ( -70.15, 132.95)    3.18                60
 10/22/2025   15:44:13   (  69.98, -59.57) 10/22/2025   15:43:57  (  69.99, -59.64)    2.86                16
 10/22/2025   16:34:45   ( -69.39, 108.61) 10/22/2025   16:33:35  ( -69.43, 107.24)   53.90                70
 10/25/2025   07:10:19   ( -70.08,-111.23) 10/25/2025   07:10:57  ( -70.07,-111.28)    2.02                38
 10/25/2025   08:01:03   (  69.94,  56.29) 10/25/2025   08:00:24  (  69.96,  56.21)    3.42                39
 10/27/2025   22:36:37   (  70.64,-163.64) 10/27/2025   22:37:46  (  70.55,-162.31)   49.98                69
 10/27/2025   23:27:09   ( -70.04,   4.61) 10/27/2025   23:27:23  ( -70.06,   4.61)    1.79                14
 10/28/2025   00:17:54   (  69.96, 172.04) 10/28/2025   00:16:50  (  69.95, 172.09)    2.64                64
 10/30/2025   14:53:18   (  70.14, -47.07) 10/30/2025   14:54:19  (  70.12, -47.04)    2.62                61
 10/30/2025   15:43:59   ( -70.02, 120.44) 10/30/2025   15:43:49  ( -70.02, 120.44)    0.43                10
 10/30/2025   16:34:34   (  69.41, -71.35) 10/30/2025   16:33:24  (  69.46, -72.68)   51.99                70