Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 7 13.  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)
 07/14/2023   23:00:49   ( -70.90,   9.59) 07/14/2023   23:01:56  ( -70.78,  11.85)   83.45                67
 07/14/2023   23:51:17   (  70.00, 178.32) 07/14/2023   23:51:34  (  70.03, 178.38)    3.54                17
 07/15/2023   00:41:59   ( -69.91, -14.22) 07/15/2023   00:41:04  ( -69.91, -14.15)    2.86                55
 07/17/2023   15:17:26   ( -70.11, 126.63) 07/17/2023   15:18:37  ( -70.09, 126.71)    3.87                71
 07/17/2023   16:08:09   (  69.95, -65.82) 07/17/2023   16:08:05  (  69.93, -65.87)    2.58                 4
 07/17/2023   16:58:49   ( -69.75, 101.80) 07/17/2023   16:57:36  ( -69.77, 101.53)   10.23                73
 07/20/2023   07:34:17   ( -70.01,-117.44) 07/20/2023   07:35:07  ( -70.03,-117.49)    3.06                50
 07/20/2023   08:25:01   (  69.90,  50.02) 07/20/2023   08:24:34  (  69.92,  50.01)    2.28                27
 07/20/2023   09:15:26   ( -68.90,-141.23) 07/20/2023   09:14:20  ( -68.93,-143.68)   98.32                66
 07/22/2023   23:51:10   ( -70.02,  -1.68) 07/22/2023   23:51:36  ( -70.00,  -1.64)    2.42                26
 07/23/2023   00:41:53   (  69.86, 165.86) 07/23/2023   00:41:03  (  69.89, 165.85)    2.90                50
 07/25/2023   15:17:22   (  70.19, -53.48) 07/25/2023   15:18:33  (  70.16, -53.16)   12.87                71
 07/25/2023   16:08:00   ( -69.93, 114.23) 07/25/2023   16:08:04  ( -69.94, 114.17)    2.98                 4
 07/25/2023   16:58:44   (  69.83, -78.31) 07/25/2023   16:57:31  (  69.83, -78.34)    1.19                73