Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 7 11.  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   (  70.03,  62.51) 07/12/2023   07:35:05  (  70.02,  62.50)    0.60                40
 07/12/2023   08:25:07   ( -69.94,-130.03) 07/12/2023   08:24:35  ( -69.91,-130.03)    3.09                32
 07/14/2023   23:00:49   ( -70.91,   9.57) 07/14/2023   23:01:56  ( -70.77,  11.83)   84.07                67
 07/14/2023   23:51:18   (  70.02, 178.30) 07/14/2023   23:51:35  (  70.01, 178.36)    2.57                17
 07/15/2023   00:41:59   ( -69.87, -14.16) 07/15/2023   00:41:05  ( -69.90, -14.16)    3.20                54
 07/17/2023   15:17:26   ( -70.07, 126.69) 07/17/2023   15:18:38  ( -70.09, 126.70)    2.01                72
 07/17/2023   16:08:10   (  69.96, -65.84) 07/17/2023   16:08:05  (  69.98, -65.80)    2.58                 5
 07/17/2023   16:58:50   ( -69.76, 101.78) 07/17/2023   16:57:36  ( -69.82, 101.60)    9.19                74
 07/20/2023   07:34:17   ( -70.02,-117.45) 07/20/2023   07:35:07  ( -70.04,-117.48)    2.51                50
 07/20/2023   08:25:01   (  69.91,  50.01) 07/20/2023   08:24:34  (  69.93,  50.01)    1.55                27
 07/20/2023   09:15:26   ( -68.91,-141.24) 07/20/2023   09:14:20  ( -68.94,-143.68)   97.54                66
 07/22/2023   23:51:10   ( -70.02,  -1.69) 07/22/2023   23:51:36  ( -70.02,  -1.62)    2.61                26
 07/23/2023   00:41:53   (  69.87, 165.85) 07/23/2023   00:41:04  (  69.85, 165.80)    2.82                49
 07/25/2023   15:17:22   (  70.19, -53.49) 07/25/2023   15:18:34  (  70.14, -53.19)   12.75                72
 07/25/2023   16:08:02   ( -69.98, 114.15) 07/25/2023   16:08:05  ( -69.98, 114.22)    2.49                 3
 07/25/2023   16:58:45   (  69.83, -78.31) 07/25/2023   16:57:33  (  69.81, -78.37)    3.03                72