Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 7 9.  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   (  70.07, -53.33) 07/09/2023   15:18:34  (  70.09, -53.29)    3.13                61
 07/09/2023   16:08:15   ( -69.98, 114.13) 07/09/2023   16:08:04  ( -69.98, 114.18)    2.22                11
 07/09/2023   16:58:49   (  69.34, -77.63) 07/09/2023   16:57:39  (  69.44, -78.91)   51.69                70
 07/12/2023   07:34:26   (  70.06,  62.46) 07/12/2023   07:35:05  (  70.05,  62.53)    2.96                39
 07/12/2023   08:25:07   ( -69.91,-130.00) 07/12/2023   08:24:35  ( -69.93,-130.00)    2.64                32
 07/14/2023   23:00:48   ( -70.89,   9.60) 07/14/2023   23:01:55  ( -70.79,  11.86)   83.39                67
 07/14/2023   23:51:17   (  70.00, 178.32) 07/14/2023   23:51:35  (  69.98, 178.31)    2.97                18
 07/15/2023   00:41:58   ( -69.85, -14.13) 07/15/2023   00:41:05  ( -69.87, -14.21)    3.38                53
 07/17/2023   15:17:26   ( -70.11, 126.63) 07/17/2023   15:18:37  ( -70.10, 126.73)    3.84                71
 07/17/2023   16:08:09   (  69.96, -65.83) 07/17/2023   16:08:05  (  69.94, -65.86)    2.03                 4
 07/17/2023   16:58:49   ( -69.75, 101.80) 07/17/2023   16:57:36  ( -69.78, 101.55)   10.03                73
 07/20/2023   07:34:18   ( -70.07,-117.53) 07/20/2023   07:35:07  ( -70.05,-117.47)    3.21                49
 07/20/2023   08:25:01   (  69.92,  50.01) 07/20/2023   08:24:34  (  69.94,  50.02)    2.20                27
 07/20/2023   09:15:26   ( -68.91,-141.24) 07/20/2023   09:14:20  ( -68.95,-143.66)   97.20                66
 07/22/2023   23:51:09   ( -69.98,  -1.62) 07/22/2023   23:51:37  ( -69.97,  -1.69)    3.05                28
 07/23/2023   00:41:53   (  69.88, 165.83) 07/23/2023   00:41:03  (  69.91, 165.87)    3.01                50