Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2025 10 18.  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)
 10/18/2025   15:18:59   (  70.05, -53.36) 10/18/2025   15:19:23  (  70.08, -53.34)    3.11                24
 10/18/2025   16:09:40   ( -69.95, 114.11) 10/18/2025   16:08:53  ( -69.97, 114.14)    2.21                47
 10/21/2025   06:45:10   ( -70.46,-105.51) 10/21/2025   06:46:21  ( -70.32,-104.76)   32.09                71
 10/21/2025   07:35:49   (  70.05,  62.43) 10/21/2025   07:35:51  (  70.04,  62.50)    2.53                 2
 10/21/2025   08:26:30   ( -69.94,-130.09) 10/21/2025   08:25:21  ( -69.93,-130.02)    2.47                69
 10/23/2025   23:01:54   ( -70.09,  10.85) 10/23/2025   23:02:53  ( -70.09,  10.80)    2.17                59
 10/23/2025   23:52:39   (  70.00, 178.29) 10/23/2025   23:52:20  (  69.97, 178.29)    3.12                19
 10/24/2025   00:43:09   ( -69.31, -13.37) 10/24/2025   00:41:59  ( -69.37, -14.90)   60.59                70
 10/26/2025   15:18:45   ( -70.10, 126.63) 10/26/2025   15:19:20  ( -70.10, 126.70)    2.86                35
 10/26/2025   16:09:29   (  69.97, -65.86) 10/26/2025   16:08:47  (  69.98, -65.82)    2.43                42
 10/29/2025   06:45:02   (  70.61,  74.30) 10/29/2025   06:46:11  (  70.50,  75.55)   48.07                69
 10/29/2025   07:35:34   ( -70.02,-117.45) 10/29/2025   07:35:48  ( -70.02,-117.52)    2.60                14
 10/29/2025   08:26:19   (  69.94,  49.97) 10/29/2025   08:25:14  (  69.95,  50.04)    3.02                65
 10/31/2025   23:01:42   (  70.12,-169.13) 10/31/2025   23:02:43  (  70.11,-169.12)    0.89                61
 10/31/2025   23:52:23   ( -69.99,  -1.62) 10/31/2025   23:52:13  ( -70.01,  -1.63)    2.25                10
 11/01/2025   00:42:58   (  69.39, 166.57) 11/01/2025   00:41:48  (  69.45, 165.24)   52.42                70