Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2025 9 12.  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)
 09/13/2025   22:12:03   ( -70.56,  22.61) 09/13/2025   22:13:13  ( -70.44,  23.68)   41.97                70
 09/13/2025   23:02:39   (  70.02,-169.25) 09/13/2025   23:02:46  (  70.01,-169.29)    2.47                 7
 09/13/2025   23:53:20   ( -69.94,  -1.79) 09/13/2025   23:52:14  ( -69.95,  -1.75)    2.28                66
 09/16/2025   14:28:47   ( -70.10, 139.10) 09/16/2025   14:29:47  ( -70.11, 139.08)    0.76                60
 09/16/2025   15:19:31   (  69.99, -53.41) 09/16/2025   15:19:14  (  70.00, -53.42)    1.78                17
 09/16/2025   16:10:03   ( -69.37, 114.81) 09/16/2025   16:08:53  ( -69.40, 113.38)   55.96                70
 09/19/2025   06:45:40   ( -70.07,-105.07) 09/19/2025   06:46:16  ( -70.09,-105.06)    1.95                36
 09/19/2025   07:36:24   (  69.96,  62.41) 09/19/2025   07:35:43  (  69.98,  62.44)    3.25                41
 09/21/2025   22:12:00   (  70.60,-157.45) 09/21/2025   22:13:09  (  70.49,-156.22)   47.22                69
 09/21/2025   23:02:33   ( -70.05,  10.75) 09/21/2025   23:02:45  ( -70.06,  10.78)    1.86                12
 09/21/2025   23:53:17   (  69.93, 178.24) 09/21/2025   23:52:12  (  69.95, 178.27)    2.73                65
 09/24/2025   14:28:44   (  70.11, -40.88) 09/24/2025   14:29:44  (  70.11, -40.88)    0.90                60
 09/24/2025   15:19:25   ( -70.02, 126.56) 09/24/2025   15:19:13  ( -70.01, 126.60)    2.01                12
 09/24/2025   16:09:58   (  69.32, -65.10) 09/24/2025   16:08:49  (  69.40, -66.59)   59.27                69