Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2025 9 13.  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   23:02:39   (  70.04,-169.26) 09/13/2025   23:02:45  (  70.05,-169.23)    2.38                 6
 09/13/2025   23:53:21   ( -69.95,  -1.81) 09/13/2025   23:52:15  ( -69.94,  -1.76)    2.28                66
 09/16/2025   14:28:47   ( -70.12, 139.08) 09/16/2025   14:29:47  ( -70.09, 139.06)    2.69                60
 09/16/2025   15:19:31   (  70.00, -53.43) 09/16/2025   15:19:14  (  69.99, -53.43)    0.83                17
 09/16/2025   16:10:02   ( -69.33, 114.87) 09/16/2025   16:08:53  ( -69.38, 113.37)   59.13                69
 09/19/2025   06:45:40   ( -70.09,-105.10) 09/19/2025   06:46:16  ( -70.08,-105.08)    1.56                36
 09/19/2025   07:36:24   (  69.97,  62.39) 09/19/2025   07:35:43  (  69.97,  62.42)    1.13                41
 09/21/2025   22:11:59   (  70.57,-157.39) 09/21/2025   22:13:09  (  70.48,-156.24)   43.99                70
 09/21/2025   23:02:33   ( -70.06,  10.72) 09/21/2025   23:02:45  ( -70.04,  10.76)    2.90                12
 09/21/2025   23:53:17   (  69.95, 178.21) 09/21/2025   23:52:12  (  69.94, 178.26)    2.13                65
 09/24/2025   14:28:44   (  70.13, -40.92) 09/24/2025   14:29:44  (  70.10, -40.90)    3.20                60
 09/24/2025   15:19:25   ( -69.99, 126.61) 09/24/2025   15:19:14  ( -70.00, 126.58)    1.03                11
 09/24/2025   16:09:59   (  69.34, -65.13) 09/24/2025   16:08:50  (  69.39, -66.61)   58.22                69
 09/27/2025   06:45:35   (  70.06,  74.97) 09/27/2025   06:46:11  (  70.09,  74.97)    3.11                36
 09/27/2025   07:36:17   ( -69.98,-117.59) 09/27/2025   07:35:41  ( -69.99,-117.54)    1.94                36