Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 6 25.  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)
 06/26/2023   06:44:03   ( -70.75,-105.97) 06/26/2023   06:45:12  ( -70.63,-104.22)   65.41                69
 06/26/2023   07:34:35   (  70.01,  62.51) 06/26/2023   07:34:48  (  70.04,  62.55)    3.34                13
 06/26/2023   08:25:17   ( -69.92,-130.03) 06/26/2023   08:24:18  ( -69.93,-129.97)    2.33                59
 06/28/2023   23:00:43   ( -70.07,  10.88) 06/28/2023   23:01:49  ( -70.07,  10.84)    1.74                66
 06/28/2023   23:51:27   (  69.96, 178.36) 06/28/2023   23:51:16  (  69.96, 178.33)    1.17                11
 06/29/2023   00:42:02   ( -69.50, -13.64) 06/29/2023   00:40:51  ( -69.58, -14.57)   36.88                71
 07/01/2023   15:17:36   ( -70.03, 126.72) 07/01/2023   15:18:17  ( -70.02, 126.66)    2.85                41
 07/01/2023   16:08:20   (  69.93, -65.81) 07/01/2023   16:07:44  (  69.90, -65.85)    3.06                36
 07/04/2023   06:43:57   (  70.63,  74.24) 07/04/2023   06:45:06  (  70.53,  75.67)   53.91                69
 07/04/2023   07:34:29   ( -70.00,-117.46) 07/04/2023   07:34:44  ( -69.99,-117.48)    1.62                15
 07/04/2023   08:25:13   (  69.90,  50.01) 07/04/2023   08:24:11  (  69.87,  50.00)    2.93                62
 07/06/2023   23:00:40   (  70.08,-169.12) 07/06/2023   23:01:40  (  70.08,-169.08)    1.44                60
 07/06/2023   23:51:22   ( -69.97,  -1.64) 07/06/2023   23:51:10  ( -69.98,  -1.59)    2.10                12
 07/07/2023   00:41:55   (  69.29, 166.66) 07/07/2023   00:40:46  (  69.36, 165.21)   57.75                69