Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2025 10 10.  Predictions up to the next  14.0 days:

     Date     Time(NOAA-21) NOAA-21 Lat/Lon Date Time(LANDSAT-9) LANDSAT-9 Lat/Lon    Distance(km)  Time Diff(sec)
 10/10/2025   14:28:36   (  70.65, -41.67) 10/10/2025   14:29:45  (  70.58, -40.24)   53.31                69
 10/10/2025   15:19:07   ( -70.02, 126.65) 10/10/2025   15:19:23  ( -70.03, 126.60)    2.74                16
 10/10/2025   16:09:52   (  69.92, -65.90) 10/10/2025   16:08:50  (  69.93, -65.90)    1.10                62
 10/13/2025   06:45:17   (  70.09,  75.00) 10/13/2025   06:46:24  (  70.10,  74.94)    2.88                67
 10/13/2025   07:35:58   ( -69.98,-117.51) 10/13/2025   07:35:54  ( -70.00,-117.58)    3.03                 4
 10/13/2025   08:26:37   (  69.57,  50.40) 10/13/2025   08:25:26  (  69.61,  49.53)   34.07                71
 10/15/2025   23:02:08   (  70.07,-169.17) 10/15/2025   23:02:54  (  70.09,-169.20)    2.86                46
 10/15/2025   23:52:50   ( -70.01,  -1.76) 10/15/2025   23:52:24  ( -69.98,  -1.72)    3.17                26
 10/18/2025   15:18:59   (  70.05, -53.36) 10/18/2025   15:19:24  (  70.05, -53.38)    0.94                25
 10/18/2025   16:09:40   ( -69.94, 114.13) 10/18/2025   16:08:54  ( -69.95, 114.11)    1.30                46
 10/21/2025   06:45:10   ( -70.44,-105.49) 10/21/2025   06:46:21  ( -70.37,-104.68)   31.05                71
 10/21/2025   07:35:49   (  70.04,  62.44) 10/21/2025   07:35:52  (  70.03,  62.48)    1.96                 3
 10/21/2025   08:26:30   ( -69.93,-130.06) 10/21/2025   08:25:22  ( -69.93,-130.03)    1.49                68
 10/23/2025   23:01:55   ( -70.12,  10.80) 10/23/2025   23:02:54  ( -70.11,  10.83)    2.06                59
 10/23/2025   23:52:39   (  69.99, 178.31) 10/23/2025   23:52:21  (  69.99, 178.30)    0.41                18