Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 5 29.  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)
 05/30/2023   15:17:46   ( -70.13, 126.58) 05/30/2023   15:18:29  ( -70.14, 126.65)    2.88                43
 05/30/2023   16:08:30   (  70.01, -65.92) 05/30/2023   16:07:57  (  69.98, -65.93)    2.41                33
 06/02/2023   06:44:11   (  70.83,  73.92) 06/02/2023   06:45:19  (  70.73,  75.75)   67.98                68
 06/02/2023   07:34:40   ( -70.06,-117.54) 06/02/2023   07:34:59  ( -70.07,-117.58)    1.76                19
 06/02/2023   08:25:24   (  69.94,  49.95) 06/02/2023   08:24:26  (  69.96,  49.91)    2.81                58
 06/04/2023   23:00:52   (  70.14,-169.21) 06/04/2023   23:01:57  (  70.13,-169.25)    1.49                65
 06/04/2023   23:51:34   ( -70.05,  -1.76) 06/04/2023   23:51:27  ( -70.02,  -1.77)    2.44                 7
 06/05/2023   00:42:11   (  69.56, 166.28) 06/05/2023   00:41:00  (  69.58, 165.27)   39.17                71
 06/07/2023   15:17:47   (  70.13, -53.44) 06/07/2023   15:18:25  (  70.12, -53.39)    2.51                38
 06/07/2023   16:08:28   ( -69.99, 114.10) 06/07/2023   16:07:55  ( -70.01, 114.10)    3.09                33
 06/10/2023   06:44:08   ( -70.77,-105.99) 06/10/2023   06:45:17  ( -70.69,-104.32)   62.07                69
 06/10/2023   07:34:41   (  70.09,  62.40) 06/10/2023   07:34:53  (  70.09,  62.44)    1.55                12
 06/10/2023   08:25:23   ( -69.99,-130.13) 06/10/2023   08:24:23  ( -69.98,-130.07)    2.54                60