Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2025 10 20.  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)
 10/21/2025   06:45:10   ( -70.43,-105.47) 10/21/2025   06:46:21  ( -70.34,-104.73)   29.41                71
 10/21/2025   07:35:49   (  70.02,  62.48) 10/21/2025   07:35:52  (  70.02,  62.46)    0.86                 3
 10/21/2025   08:26:30   ( -69.91,-130.04) 10/21/2025   08:25:22  ( -69.90,-130.07)    1.54                68
 10/23/2025   23:01:55   ( -70.12,  10.81) 10/23/2025   23:02:53  ( -70.09,  10.81)    2.86                58
 10/23/2025   23:52:38   (  69.98, 178.33) 10/23/2025   23:52:19  (  69.99, 178.30)    1.68                19
 10/24/2025   00:43:08   ( -69.29, -13.34) 10/24/2025   00:41:59  ( -69.33, -14.97)   64.24                69
 10/26/2025   15:18:44   ( -70.08, 126.66) 10/26/2025   15:19:19  ( -70.08, 126.68)    0.93                35
 10/26/2025   16:09:28   (  69.94, -65.83) 10/26/2025   16:08:46  (  69.97, -65.83)    2.71                42
 10/29/2025   06:45:00   (  70.54,  74.41) 10/29/2025   06:46:10  (  70.46,  75.49)   41.34                70
 10/29/2025   07:35:33   ( -70.00,-117.43) 10/29/2025   07:35:46  ( -70.02,-117.51)    3.57                13
 10/29/2025   08:26:18   (  69.92,  50.00) 10/29/2025   08:25:13  (  69.91,  49.98)    1.84                65
 10/31/2025   23:01:42   (  70.11,-169.12) 10/31/2025   23:02:41  (  70.14,-169.08)    3.26                59
 10/31/2025   23:52:23   ( -69.99,  -1.61) 10/31/2025   23:52:12  ( -69.98,  -1.67)    2.36                11
 11/01/2025   00:42:57   (  69.33, 166.66) 11/01/2025   00:41:48  (  69.36, 165.14)   60.03                69
 11/03/2025   15:18:31   (  70.06, -53.25) 11/03/2025   15:19:07  (  70.05, -53.30)    2.42                36
 11/03/2025   16:09:11   ( -69.93, 114.27) 11/03/2025   16:08:36  ( -69.95, 114.19)    3.56                35