Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2025 4 23.  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)
 04/25/2025   14:27:57   ( -70.77, 138.34) 04/25/2025   14:29:06  ( -70.68, 139.84)   55.71                69
 04/25/2025   15:18:31   (  70.16, -53.38) 04/25/2025   15:18:41  (  70.14, -53.31)    3.19                10
 04/25/2025   16:09:13   ( -70.04, 114.11) 04/25/2025   16:08:11  ( -70.03, 114.16)    2.68                62
 04/28/2025   06:44:35   ( -70.20,-104.97) 04/28/2025   06:45:39  ( -70.18,-105.01)    2.90                64
 04/28/2025   07:35:18   (  70.07,  62.55) 04/28/2025   07:35:06  (  70.07,  62.48)    2.70                12
 04/28/2025   08:25:53   ( -69.58,-129.41) 04/28/2025   08:24:42  ( -69.63,-130.50)   42.45                71
 04/30/2025   23:01:24   ( -70.18,  10.87) 04/30/2025   23:02:03  ( -70.19,  10.89)    1.41                39
 04/30/2025   23:52:08   (  70.09, 178.31) 04/30/2025   23:51:30  (  70.07, 178.38)    3.47                38
 05/03/2025   14:27:41   (  70.80, -41.65) 05/03/2025   14:28:50  (  70.64, -40.17)   56.94                69
 05/03/2025   15:18:13   ( -70.16, 126.69) 05/03/2025   15:18:27  ( -70.15, 126.74)    2.14                14
 05/03/2025   16:08:56   (  70.02, -65.79) 05/03/2025   16:07:54  (  70.04, -65.78)    1.58                62
 05/06/2025   06:44:19   (  70.21,  75.08) 05/06/2025   06:45:21  (  70.19,  75.06)    3.39                62
 05/06/2025   07:35:01   ( -70.10,-117.43) 05/06/2025   07:34:51  ( -70.08,-117.46)    2.95                10
 05/06/2025   08:25:35   (  69.49,  50.80) 05/06/2025   08:24:25  (  69.57,  49.49)   51.82                70