Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2025 9 14.  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)
 09/16/2025   14:28:47   ( -70.09, 139.12) 09/16/2025   14:29:47  ( -70.12, 139.10)    2.90                60
 09/16/2025   15:19:32   (  70.03, -53.48) 09/16/2025   15:19:14  (  70.02, -53.40)    3.15                18
 09/16/2025   16:10:03   ( -69.36, 114.83) 09/16/2025   16:08:53  ( -69.41, 113.40)   56.08                70
 09/19/2025   06:45:40   ( -70.07,-105.06) 09/19/2025   06:46:17  ( -70.05,-105.12)    3.02                37
 09/19/2025   07:36:24   (  69.95,  62.43) 09/19/2025   07:35:44  (  69.94,  62.38)    1.92                40
 09/21/2025   22:12:00   (  70.60,-157.44) 09/21/2025   22:13:10  (  70.45,-156.28)   46.05                70
 09/21/2025   23:02:32   ( -70.04,  10.75) 09/21/2025   23:02:44  ( -70.07,  10.80)    3.32                12
 09/21/2025   23:53:16   (  69.92, 178.24) 09/21/2025   23:52:12  (  69.91, 178.21)    2.24                64
 09/24/2025   14:28:43   (  70.11, -40.88) 09/24/2025   14:29:43  (  70.13, -40.87)    2.08                60
 09/24/2025   15:19:25   ( -70.03, 126.56) 09/24/2025   15:19:13  ( -70.02, 126.62)    2.21                12
 09/24/2025   16:09:59   (  69.37, -65.17) 09/24/2025   16:08:49  (  69.41, -66.58)   55.06                70
 09/27/2025   06:45:35   (  70.04,  75.00) 09/27/2025   06:46:12  (  70.06,  74.92)    3.32                37
 09/27/2025   07:36:17   ( -69.96,-117.56) 09/27/2025   07:35:42  ( -69.95,-117.59)    1.17                35