Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 2 8.  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)
 02/10/2023   06:45:10   (  71.11,  73.48) 02/10/2023   06:46:16  (  71.01,  76.21)   98.92                66
 02/10/2023   07:35:34   ( -70.08,-117.54) 02/10/2023   07:36:01  ( -70.07,-117.55)    0.90                27
 02/10/2023   08:26:18   (  69.96,  49.95) 02/10/2023   08:25:28  (  69.97,  49.95)    0.87                50
 02/12/2023   23:01:47   (  70.32,-169.45) 02/12/2023   23:02:58  (  70.26,-169.04)   16.63                71
 02/12/2023   23:52:25   ( -70.01,  -1.67) 02/12/2023   23:52:30  ( -70.04,  -1.72)    3.22                 5
 02/13/2023   00:43:10   (  69.96, 165.73) 02/13/2023   00:41:57  (  69.93, 165.78)    3.21                73
 02/15/2023   15:18:34   (  70.11, -53.35) 02/15/2023   15:19:27  (  70.13, -53.34)    2.16                53
 02/15/2023   16:09:16   ( -70.02, 114.11) 02/15/2023   16:08:57  ( -70.02, 114.14)    1.34                19
 02/15/2023   16:59:45   (  69.11, -77.27) 02/15/2023   16:58:38  (  69.14, -79.41)   84.77                67
 02/18/2023   07:35:25   (  70.08,  62.48) 02/18/2023   07:35:55  (  70.07,  62.47)    0.52                30
 02/18/2023   08:26:07   ( -69.98,-130.06) 02/18/2023   08:25:25  ( -69.97,-130.05)    1.47                42
 02/20/2023   23:01:39   ( -70.52,  10.25) 02/20/2023   23:02:50  ( -70.42,  11.21)   37.41                71
 02/20/2023   23:52:16   (  70.05, 178.29) 02/20/2023   23:52:22  (  70.04, 178.30)    1.93                 6
 02/21/2023   00:42:58   ( -69.95, -14.24) 02/21/2023   00:41:52  ( -69.93, -14.21)    2.80                66