Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 4 16.  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)
 04/17/2023   23:01:05   (  70.62,-169.90) 04/17/2023   23:02:15  (  70.47,-168.72)   46.98                70
 04/17/2023   23:51:38   ( -70.06,  -1.71) 04/17/2023   23:51:50  ( -70.08,  -1.65)    3.23                12
 04/18/2023   00:42:22   (  69.95, 165.77) 04/18/2023   00:41:18  (  69.92, 165.78)    2.63                64
 04/20/2023   15:17:46   (  70.15, -53.37) 04/20/2023   15:18:50  (  70.14, -53.33)    1.81                64
 04/20/2023   16:08:27   ( -70.01, 114.16) 04/20/2023   16:08:20  ( -70.03, 114.15)    2.21                 7
 04/20/2023   16:59:04   (  69.52, -77.81) 04/20/2023   16:57:53  (  69.59, -78.81)   39.52                71
 04/23/2023   07:34:35   (  70.10,  62.49) 04/23/2023   07:35:19  (  70.09,  62.48)    1.68                44
 04/23/2023   08:25:16   ( -69.96,-129.98) 04/23/2023   08:24:49  ( -69.98,-130.04)    3.14                27
 04/25/2023   23:51:23   (  70.07, 178.32) 04/25/2023   23:51:46  (  70.06, 178.31)    1.95                23
 04/26/2023   00:42:04   ( -69.93, -14.14) 04/26/2023   00:41:16  ( -69.95, -14.20)    3.42                48
 04/28/2023   15:17:32   ( -70.37, 126.35) 04/28/2023   15:18:44  ( -70.26, 126.84)   21.92                72
 04/28/2023   16:08:12   (  70.05, -65.86) 04/28/2023   16:08:13  (  70.04, -65.83)    2.18                 1
 04/28/2023   16:58:53   ( -69.91, 101.68) 04/28/2023   16:57:43  ( -69.93, 101.65)    3.08                70