Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 7 7.  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)
 07/09/2023   15:17:33   (  70.06, -53.32) 07/09/2023   15:18:35  (  70.05, -53.35)    2.04                62
 07/09/2023   16:08:15   ( -69.97, 114.14) 07/09/2023   16:08:04  ( -69.99, 114.20)    3.28                11
 07/09/2023   16:58:50   (  69.38, -77.69) 07/09/2023   16:57:40  (  69.39, -78.98)   50.54                70
 07/12/2023   07:34:25   (  70.05,  62.48) 07/12/2023   07:35:04  (  70.05,  62.54)    2.27                39
 07/12/2023   08:25:07   ( -69.95,-130.06) 07/12/2023   08:24:34  ( -69.94,-129.99)    2.98                33
 07/14/2023   23:00:48   ( -70.88,   9.62) 07/14/2023   23:01:55  ( -70.79,  11.87)   82.66                67
 07/14/2023   23:51:17   (  69.99, 178.34) 07/14/2023   23:51:35  (  69.98, 178.31)    1.82                18
 07/15/2023   00:41:59   ( -69.89, -14.19) 07/15/2023   00:41:05  ( -69.87, -14.20)    2.30                54
 07/17/2023   15:17:26   ( -70.10, 126.65) 07/17/2023   15:18:37  ( -70.10, 126.73)    3.10                71
 07/17/2023   16:08:09   (  69.94, -65.81) 07/17/2023   16:08:05  (  69.94, -65.86)    1.98                 4
 07/17/2023   16:58:49   ( -69.73, 101.82) 07/17/2023   16:57:36  ( -69.78, 101.55)   11.28                73
 07/20/2023   07:34:18   ( -70.05,-117.51) 07/20/2023   07:35:07  ( -70.04,-117.47)    1.75                49
 07/20/2023   08:25:01   (  69.90,  50.03) 07/20/2023   08:24:34  (  69.93,  50.01)    2.74                27