Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 5 7.  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)
 05/09/2023   07:34:36   (  70.10,  62.45) 05/09/2023   07:35:08  (  70.09,  62.47)    1.74                32
 05/09/2023   08:25:17   ( -69.97,-130.02) 05/09/2023   08:24:38  ( -69.97,-130.05)    1.36                39
 05/11/2023   23:00:53   ( -70.51,  10.26) 05/11/2023   23:02:04  ( -70.44,  11.21)   36.27                71
 05/11/2023   23:51:31   (  70.08, 178.25) 05/11/2023   23:51:36  (  70.06, 178.31)    3.07                 5
 05/12/2023   00:42:12   ( -69.94, -14.22) 05/12/2023   00:41:06  ( -69.95, -14.21)    0.89                66
 05/14/2023   15:17:42   ( -70.13, 126.62) 05/14/2023   15:18:38  ( -70.10, 126.61)    2.90                56
 05/14/2023   16:08:26   (  70.01, -65.89) 05/14/2023   16:08:05  (  69.99, -65.90)    1.91                21
 05/14/2023   16:58:55   ( -69.23, 102.56) 05/14/2023   16:57:46  ( -69.28, 100.76)   71.05                69
 05/17/2023   07:34:37   ( -70.07,-117.53) 05/17/2023   07:35:06  ( -70.07,-117.56)    1.45                29
 05/17/2023   08:25:21   (  69.96,  49.96) 05/17/2023   08:24:33  (  69.96,  49.92)    1.39                48
 05/19/2023   23:00:51   (  70.17,-169.23) 05/19/2023   23:02:03  (  70.16,-169.19)    2.18                72
 05/19/2023   23:51:32   ( -70.03,  -1.69) 05/19/2023   23:51:33  ( -70.06,  -1.70)    3.54                 1
 05/20/2023   00:42:14   (  69.81, 165.95) 05/20/2023   00:41:02  (  69.83, 165.63)   12.46                72