Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 7 6.  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)
 07/06/2023   23:00:48   (  70.51,-169.80) 07/06/2023   23:01:58  (  70.39,-168.73)   41.69                70
 07/06/2023   23:51:22   ( -70.00,  -1.68) 07/06/2023   23:51:33  ( -70.00,  -1.66)    1.10                11
 07/07/2023   00:42:06   (  69.89, 165.80) 07/07/2023   00:41:00  (  69.91, 165.85)    2.93                66
 07/09/2023   15:17:33   (  70.07, -53.33) 07/09/2023   15:18:35  (  70.04, -53.36)    3.34                62
 07/09/2023   16:08:15   ( -69.97, 114.13) 07/09/2023   16:08:04  ( -69.98, 114.19)    2.59                11
 07/09/2023   16:58:49   (  69.33, -77.62) 07/09/2023   16:57:39  (  69.44, -78.91)   51.83                70
 07/12/2023   07:34:26   (  70.05,  62.47) 07/12/2023   07:35:05  (  70.05,  62.53)    2.54                39
 07/12/2023   08:25:07   ( -69.90,-129.99) 07/12/2023   08:24:36  ( -69.89,-130.06)    3.32                31
 07/14/2023   23:00:48   ( -70.88,   9.62) 07/14/2023   23:01:55  ( -70.80,  11.88)   82.96                67
 07/14/2023   23:51:17   (  69.99, 178.34) 07/14/2023   23:51:35  (  69.99, 178.32)    0.89                18
 07/15/2023   00:41:59   ( -69.89, -14.19) 07/15/2023   00:41:05  ( -69.88, -14.19)    1.15                54
 07/17/2023   15:17:26   ( -70.09, 126.66) 07/17/2023   15:18:38  ( -70.07, 126.68)    2.52                72
 07/17/2023   16:08:09   (  69.94, -65.80) 07/17/2023   16:08:05  (  69.95, -65.84)    2.24                 4
 07/17/2023   16:58:49   ( -69.73, 101.83) 07/17/2023   16:57:36  ( -69.80, 101.58)   12.34                73