Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 5 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)
 05/19/2023   23:00:51   (  70.18,-169.24) 05/19/2023   23:02:02  (  70.19,-169.14)    4.04                71
 05/19/2023   23:51:32   ( -70.05,  -1.72) 05/19/2023   23:51:32  ( -70.07,  -1.68)    3.37                 0
 05/20/2023   00:42:14   (  69.81, 165.94) 05/20/2023   00:41:01  (  69.86, 165.67)   11.50                73
 05/22/2023   15:17:46   (  70.13, -53.41) 05/22/2023   15:18:30  (  70.11, -53.37)    2.26                44
 05/22/2023   16:08:27   ( -69.99, 114.12) 05/22/2023   16:08:00  ( -70.00, 114.10)    0.89                27
 05/25/2023   06:44:11   ( -70.94,-106.24) 05/25/2023   06:45:18  ( -70.83,-104.07)   79.96                67
 05/25/2023   07:34:41   (  70.08,  62.43) 05/25/2023   07:34:57  (  70.07,  62.45)    2.07                16
 05/25/2023   08:25:22   ( -69.95,-130.05) 05/25/2023   08:24:27  ( -69.96,-130.07)    1.61                55
 05/27/2023   23:00:52   ( -70.16,  10.76) 05/27/2023   23:01:56  ( -70.17,  10.84)    2.87                64
 05/27/2023   23:51:36   (  70.05, 178.25) 05/27/2023   23:51:23  (  70.06, 178.32)    3.15                13
 05/28/2023   00:42:10   ( -69.53, -13.67) 05/28/2023   00:40:59  ( -69.62, -14.65)   39.14                71
 05/30/2023   15:17:45   ( -70.07, 126.66) 05/30/2023   15:18:22  ( -70.09, 126.61)    2.87                37
 05/30/2023   16:08:29   (  69.96, -65.86) 05/30/2023   16:07:49  (  69.98, -65.91)    2.63                40