Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 7 10.  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)
 07/12/2023   07:34:25   (  70.05,  62.48) 07/12/2023   07:35:04  (  70.06,  62.54)    2.76                39
 07/12/2023   08:25:06   ( -69.90,-129.99) 07/12/2023   08:24:35  ( -69.89,-130.06)    3.36                31
 07/14/2023   23:00:48   ( -70.88,   9.62) 07/14/2023   23:01:55  ( -70.81,  11.89)   83.06                67
 07/14/2023   23:51:17   (  69.99, 178.35) 07/14/2023   23:51:35  (  70.00, 178.34)    1.20                18
 07/15/2023   00:41:59   ( -69.89, -14.19) 07/15/2023   00:41:05  ( -69.89, -14.18)    0.61                54
 07/17/2023   15:17:26   ( -70.08, 126.66) 07/17/2023   15:18:38  ( -70.08, 126.69)    1.31                72
 07/17/2023   16:08:10   (  69.98, -65.87) 07/17/2023   16:08:05  (  69.97, -65.81)    2.46                 5
 07/17/2023   16:58:49   ( -69.72, 101.83) 07/17/2023   16:57:37  ( -69.75, 101.52)   12.61                72
 07/20/2023   07:34:18   ( -70.03,-117.48) 07/20/2023   07:35:08  ( -70.04,-117.48)    0.86                50
 07/20/2023   08:25:02   (  69.93,  49.98) 07/20/2023   08:24:35  (  69.93,  50.01)    0.99                27
 07/20/2023   09:15:27   ( -68.93,-141.26) 07/20/2023   09:14:20  ( -69.00,-143.61)   94.05                67
 07/22/2023   23:51:09   ( -69.98,  -1.62) 07/22/2023   23:51:37  ( -69.98,  -1.68)    2.17                28
 07/23/2023   00:41:53   (  69.88, 165.83) 07/23/2023   00:41:04  (  69.87, 165.81)    2.06                49