Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 4 18.  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)
 04/20/2023   15:17:45   (  70.12, -53.33) 04/20/2023   15:18:50  (  70.11, -53.37)    2.42                65
 04/20/2023   16:08:27   ( -70.04, 114.11) 04/20/2023   16:08:19  ( -70.05, 114.18)    2.53                 8
 04/20/2023   16:59:03   (  69.50, -77.78) 04/20/2023   16:57:53  (  69.56, -78.85)   42.40                70
 04/23/2023   07:34:34   (  70.08,  62.52) 04/23/2023   07:35:18  (  70.11,  62.50)    2.60                44
 04/23/2023   08:25:16   ( -70.00,-130.04) 04/23/2023   08:24:48  ( -70.00,-130.02)    0.70                28
 04/25/2023   23:51:23   (  70.06, 178.34) 04/25/2023   23:51:46  (  70.06, 178.32)    0.77                23
 04/26/2023   00:42:05   ( -69.97, -14.21) 04/26/2023   00:41:16  ( -69.96, -14.20)    1.92                49
 04/28/2023   15:17:32   ( -70.37, 126.35) 04/28/2023   15:18:43  ( -70.31, 126.91)   22.06                71
 04/28/2023   16:08:12   (  70.05, -65.85) 04/28/2023   16:08:13  (  70.03, -65.84)    2.29                 1
 04/28/2023   16:58:53   ( -69.91, 101.68) 04/28/2023   16:57:43  ( -69.92, 101.65)    2.38                70
 05/01/2023   07:34:15   ( -70.11,-117.45) 05/01/2023   07:35:11  ( -70.12,-117.46)    2.13                56
 05/01/2023   08:24:59   (  70.00,  50.01) 05/01/2023   08:24:38  (  70.01,  50.02)    0.71                21