Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 4 19.  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   (  70.11, -53.32) 04/20/2023   15:18:50  (  70.11, -53.37)    1.75                65
 04/20/2023   16:08:27   ( -70.03, 114.12) 04/20/2023   16:08:19  ( -70.05, 114.18)    3.21                 8
 04/20/2023   16:59:04   (  69.54, -77.85) 04/20/2023   16:57:53  (  69.56, -78.85)   38.94                71
 04/23/2023   07:34:35   (  70.13,  62.44) 04/23/2023   07:35:18  (  70.11,  62.51)    3.34                43
 04/23/2023   08:25:16   ( -69.99,-130.03) 04/23/2023   08:24:48  ( -70.00,-130.01)    0.82                28
 04/25/2023   23:51:23   (  70.06, 178.35) 04/25/2023   23:51:46  (  70.06, 178.32)    1.27                23
 04/26/2023   00:42:05   ( -69.97, -14.20) 04/26/2023   00:41:16  ( -69.95, -14.20)    1.62                49
 04/28/2023   15:17:32   ( -70.36, 126.35) 04/28/2023   15:18:43  ( -70.30, 126.90)   21.79                71
 04/28/2023   16:08:12   (  70.05, -65.85) 04/28/2023   16:08:13  (  70.02, -65.85)    2.57                 1
 04/28/2023   16:58:53   ( -69.91, 101.68) 04/28/2023   16:57:43  ( -69.92, 101.64)    2.30                70
 05/01/2023   07:34:15   ( -70.11,-117.45) 05/01/2023   07:35:11  ( -70.11,-117.48)    1.25                56
 05/01/2023   08:24:59   (  70.00,  50.01) 05/01/2023   08:24:38  (  70.00,  50.00)    0.85                21