Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 7 12.  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)
 07/14/2023   23:00:48   ( -70.87,   9.64) 07/14/2023   23:01:55  ( -70.81,  11.89)   82.50                67
 07/14/2023   23:51:17   (  69.98, 178.36) 07/14/2023   23:51:35  (  70.00, 178.34)    2.29                18
 07/15/2023   00:41:59   ( -69.88, -14.18) 07/15/2023   00:41:05  ( -69.88, -14.19)    0.27                54
 07/17/2023   15:17:26   ( -70.08, 126.67) 07/17/2023   15:18:38  ( -70.06, 126.67)    2.06                72
 07/17/2023   16:08:10   (  69.98, -65.86) 07/17/2023   16:08:05  (  69.96, -65.83)    2.26                 5
 07/17/2023   16:58:49   ( -69.72, 101.84) 07/17/2023   16:57:36  ( -69.79, 101.57)   13.16                73
 07/20/2023   07:34:18   ( -70.03,-117.47) 07/20/2023   07:35:07  ( -70.06,-117.45)    3.33                49
 07/20/2023   08:25:02   (  69.93,  49.99) 07/20/2023   08:24:34  (  69.95,  50.04)    3.30                28
 07/20/2023   09:15:26   ( -68.92,-141.26) 07/20/2023   09:14:19  ( -68.96,-143.65)   95.77                67
 07/22/2023   23:51:09   ( -69.98,  -1.62) 07/22/2023   23:51:36  ( -69.97,  -1.68)    2.39                27
 07/23/2023   00:41:53   (  69.88, 165.83) 07/23/2023   00:41:03  (  69.86, 165.81)    2.43                50
 07/25/2023   15:17:22   (  70.21, -53.51) 07/25/2023   15:18:33  (  70.13, -53.20)   14.20                71
 07/25/2023   16:08:02   ( -69.99, 114.14) 07/25/2023   16:08:04  ( -69.97, 114.21)    3.51                 2
 07/25/2023   16:58:44   (  69.79, -78.25) 07/25/2023   16:57:32  (  69.81, -78.38)    5.11                72