Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2025 4 12.  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)
 04/12/2025   06:45:04   ( -70.16,-105.02) 04/12/2025   06:45:54  ( -70.19,-105.02)    3.32                50
 04/12/2025   07:35:48   (  70.08,  62.42) 04/12/2025   07:35:21  (  70.09,  62.48)    2.56                27
 04/12/2025   08:26:13   ( -69.06,-128.79) 04/12/2025   08:25:07  ( -69.10,-131.23)   97.08                66
 04/14/2025   23:01:55   ( -70.17,  10.76) 04/14/2025   23:02:23  ( -70.17,  10.82)    2.45                28
 04/14/2025   23:52:38   (  70.04, 178.27) 04/14/2025   23:51:50  (  70.06, 178.32)    3.04                48
 04/17/2025   14:28:07   (  70.47, -41.24) 04/17/2025   14:29:19  (  70.37, -40.64)   25.19                72
 04/17/2025   15:18:44   ( -70.09, 126.68) 04/17/2025   15:18:52  ( -70.09, 126.60)    3.06                 8
 04/17/2025   16:09:28   (  70.01, -65.89) 04/17/2025   16:08:19  (  69.98, -65.91)    3.00                69
 04/20/2025   06:44:52   (  70.19,  74.99) 04/20/2025   06:45:49  (  70.19,  74.98)    0.72                57
 04/20/2025   07:35:34   ( -70.07,-117.51) 04/20/2025   07:35:19  ( -70.08,-117.54)    1.72                15
 04/20/2025   08:26:04   (  69.30,  50.93) 04/20/2025   08:24:56  (  69.36,  49.12)   71.22                68
 04/22/2025   23:01:41   (  70.19,-169.22) 04/22/2025   23:02:14  (  70.18,-169.14)    3.12                33
 04/22/2025   23:52:23   ( -70.07,  -1.71) 04/22/2025   23:51:44  ( -70.08,  -1.66)    2.30                39
 04/25/2025   14:27:56   ( -70.74, 138.38) 04/25/2025   14:29:06  ( -70.62, 139.76)   52.23                70
 04/25/2025   15:18:30   (  70.15, -53.36) 04/25/2025   15:18:40  (  70.12, -53.33)    2.94                10
 04/25/2025   16:09:12   ( -70.02, 114.15) 04/25/2025   16:08:10  ( -70.02, 114.16)    0.39                62