Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2025 9 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)
 09/19/2025   06:45:40   ( -70.09,-105.09) 09/19/2025   06:46:16  ( -70.07,-105.08)    1.60                36
 09/19/2025   07:36:24   (  69.96,  62.40) 09/19/2025   07:35:43  (  69.97,  62.42)    1.48                41
 09/21/2025   22:11:59   (  70.56,-157.38) 09/21/2025   22:13:09  (  70.47,-156.25)   43.23                70
 09/21/2025   23:02:32   ( -70.01,  10.80) 09/21/2025   23:02:45  ( -70.03,  10.74)    2.92                13
 09/21/2025   23:53:17   (  69.94, 178.22) 09/21/2025   23:52:12  (  69.93, 178.24)    1.71                65
 09/24/2025   14:28:44   (  70.13, -40.91) 09/24/2025   14:29:43  (  70.13, -40.86)    2.27                59
 09/24/2025   15:19:25   ( -70.00, 126.60) 09/24/2025   15:19:13  ( -70.02, 126.62)    2.94                12
 09/24/2025   16:09:59   (  69.34, -65.12) 09/24/2025   16:08:50  (  69.36, -66.64)   59.50                69
 09/27/2025   06:45:35   (  70.06,  74.97) 09/27/2025   06:46:11  (  70.05,  74.91)    2.52                36
 09/27/2025   07:36:17   ( -69.98,-117.60) 09/27/2025   07:35:40  ( -69.99,-117.53)    2.89                37
 09/29/2025   22:11:54   ( -70.71,  22.42) 09/29/2025   22:13:03  ( -70.60,  23.97)   58.16                69
 09/29/2025   23:02:28   (  70.05,-169.24) 09/29/2025   23:02:38  (  70.05,-169.19)    2.13                10
 09/29/2025   23:53:09   ( -69.93,  -1.73) 09/29/2025   23:52:08  ( -69.95,  -1.70)    2.69                61
 10/02/2025   14:28:36   ( -70.13, 139.12) 10/02/2025   14:29:39  ( -70.10, 139.13)    3.05                63
 10/02/2025   15:19:20   (  70.00, -53.38) 10/02/2025   15:19:06  (  69.99, -53.39)    1.80                14
 10/02/2025   16:09:53   ( -69.45, 114.75) 10/02/2025   16:08:43  ( -69.50, 113.57)   46.29                70