Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2025 6 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)
 06/20/2025   14:28:46   (  70.11, -40.90) 06/20/2025   14:29:11  (  70.12, -40.88)    1.22                25
 06/20/2025   15:19:27   ( -70.00, 126.59) 06/20/2025   15:18:41  ( -70.01, 126.60)    0.97                46
 06/23/2025   05:55:01   ( -70.38, -92.86) 06/23/2025   05:56:13  ( -70.31, -92.37)   19.89                72
 06/23/2025   06:45:42   (  70.08,  74.91) 06/23/2025   06:45:42  (  70.09,  74.96)    2.36                 0
 06/23/2025   07:36:23   ( -69.96,-117.59) 06/23/2025   07:35:12  ( -69.99,-117.56)    2.75                71
 06/25/2025   22:11:52   ( -70.14,  23.28) 06/25/2025   22:12:45  ( -70.16,  23.29)    2.21                53
 06/25/2025   23:02:37   (  70.05,-169.28) 06/25/2025   23:02:12  (  70.05,-169.22)    2.32                25
 06/25/2025   23:53:03   ( -69.14,  -0.63) 06/25/2025   23:51:56  ( -69.18,  -2.78)   85.21                67
 06/28/2025   14:28:48   ( -70.11, 139.09) 06/28/2025   14:29:16  ( -70.10, 139.09)    1.15                28
 06/28/2025   15:19:32   (  69.98, -53.40) 06/28/2025   15:18:43  (  69.99, -53.43)    1.36                49
 07/01/2025   05:55:04   (  70.28,  87.28) 07/01/2025   05:56:15  (  70.23,  87.53)   10.36                71
 07/01/2025   06:45:44   ( -70.09,-105.11) 07/01/2025   06:45:46  ( -70.08,-105.06)    2.20                 2
 07/01/2025   07:36:27   (  69.91,  62.47) 07/01/2025   07:35:14  (  69.91,  62.35)    4.70                73