Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 7 17.  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)
 07/20/2023   07:34:17   ( -70.01,-117.45) 07/20/2023   07:35:07  ( -70.02,-117.50)    2.03                50
 07/20/2023   08:25:01   (  69.91,  50.02) 07/20/2023   08:24:34  (  69.92,  50.00)    1.55                27
 07/20/2023   09:15:26   ( -68.91,-141.24) 07/20/2023   09:14:19  ( -68.98,-143.63)   95.72                67
 07/22/2023   23:00:45   (  71.02,-170.60) 07/22/2023   23:01:51  (  70.92,-167.91)   97.93                66
 07/22/2023   23:51:09   ( -69.97,  -1.61) 07/22/2023   23:51:36  ( -69.98,  -1.66)    2.23                27
 07/23/2023   00:41:53   (  69.87, 165.85) 07/23/2023   00:41:03  (  69.88, 165.84)    1.28                50
 07/25/2023   15:17:22   (  70.20, -53.50) 07/25/2023   15:18:33  (  70.14, -53.18)   13.67                71
 07/25/2023   16:08:01   ( -69.94, 114.22) 07/25/2023   16:08:04  ( -69.98, 114.22)    3.71                 3
 07/25/2023   16:58:44   (  69.79, -78.24) 07/25/2023   16:57:32  (  69.81, -78.37)    5.47                72
 07/28/2023   07:34:10   (  70.02,  62.56) 07/28/2023   07:35:01  (  70.05,  62.58)    2.92                51
 07/28/2023   08:24:52   ( -69.92,-129.97) 07/28/2023   08:24:31  ( -69.94,-129.94)    2.67                21
 07/28/2023   09:15:20   (  68.97,  38.70) 07/28/2023   09:14:13  (  69.00,  36.44)   90.38                67
 07/30/2023   23:51:02   (  70.01, 178.36) 07/30/2023   23:51:29  (  69.98, 178.38)    2.94                27
 07/31/2023   00:41:44   ( -69.90, -14.16) 07/31/2023   00:40:59  ( -69.88, -14.14)    2.92                45