Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2025 4 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)
 04/20/2025   06:44:52   (  70.21,  74.96) 04/20/2025   06:45:49  (  70.17,  74.96)    3.74                57
 04/20/2025   07:35:34   ( -70.09,-117.54) 04/20/2025   07:35:18  ( -70.11,-117.49)    2.89                16
 04/20/2025   08:26:05   (  69.32,  50.91) 04/20/2025   08:24:57  (  69.35,  49.10)   70.84                68
 04/22/2025   23:01:41   (  70.15,-169.15) 04/22/2025   23:02:16  (  70.13,-169.22)    3.26                35
 04/22/2025   23:52:24   ( -70.08,  -1.74) 04/22/2025   23:51:45  ( -70.07,  -1.67)    3.08                39
 04/25/2025   14:27:56   ( -70.75, 138.36) 04/25/2025   14:29:06  ( -70.64, 139.78)   53.37                70
 04/25/2025   15:18:30   (  70.15, -53.36) 04/25/2025   15:18:40  (  70.15, -53.30)    2.62                10
 04/25/2025   16:09:12   ( -70.03, 114.13) 04/25/2025   16:08:10  ( -70.04, 114.18)    2.04                62
 04/28/2025   06:44:35   ( -70.19,-104.94) 04/28/2025   06:45:39  ( -70.19,-104.99)    1.84                64
 04/28/2025   07:35:19   (  70.11,  62.49) 04/28/2025   07:35:06  (  70.08,  62.50)    3.13                13
 04/28/2025   08:25:53   ( -69.57,-129.39) 04/28/2025   08:24:42  ( -69.64,-130.48)   43.13                71
 04/30/2025   23:01:24   ( -70.16,  10.89) 04/30/2025   23:02:04  ( -70.14,  10.83)    3.31                40
 04/30/2025   23:52:08   (  70.08, 178.33) 04/30/2025   23:51:30  (  70.08, 178.39)    2.35                38
 05/03/2025   14:27:41   (  70.78, -41.62) 05/03/2025   14:28:50  (  70.65, -40.16)   55.71                69
 05/03/2025   15:18:13   ( -70.14, 126.72) 05/03/2025   15:18:27  ( -70.16, 126.75)    2.15                14
 05/03/2025   16:08:56   (  70.01, -65.77) 05/03/2025   16:07:54  (  70.04, -65.77)    3.50                62