Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 7 19.  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   ( -70.02,-117.46) 07/20/2023   07:35:07  ( -70.01,-117.51)    2.25                50
 07/20/2023   08:25:01   (  69.91,  50.02) 07/20/2023   08:24:34  (  69.91,  50.00)    0.97                27
 07/20/2023   09:15:26   ( -68.92,-141.24) 07/20/2023   09:14:19  ( -68.97,-143.64)   95.71                67
 07/22/2023   23:00:45   (  71.02,-170.60) 07/22/2023   23:01:51  (  70.91,-167.92)   97.74                66
 07/22/2023   23:51:09   ( -69.98,  -1.62) 07/22/2023   23:51:36  ( -69.97,  -1.68)    2.35                27
 07/23/2023   00:41:53   (  69.87, 165.85) 07/23/2023   00:41:03  (  69.87, 165.82)    1.06                50
 07/25/2023   15:17:22   (  70.20, -53.50) 07/25/2023   15:18:33  (  70.13, -53.20)   13.85                71
 07/25/2023   16:08:01   ( -69.95, 114.21) 07/25/2023   16:08:04  ( -69.96, 114.20)    1.87                 3
 07/25/2023   16:58:44   (  69.79, -78.24) 07/25/2023   16:57:32  (  69.80, -78.38)    5.55                72
 07/28/2023   07:34:10   (  70.02,  62.56) 07/28/2023   07:35:01  (  70.03,  62.55)    1.25                51
 07/28/2023   08:24:52   ( -69.92,-129.97) 07/28/2023   08:24:31  ( -69.92,-129.97)    0.23                21
 07/28/2023   09:15:19   (  68.91,  38.78) 07/28/2023   09:14:13  (  68.98,  36.42)   94.68                66
 07/30/2023   23:51:02   (  70.00, 178.37) 07/30/2023   23:51:28  (  70.01, 178.42)    2.47                26
 07/31/2023   00:41:44   ( -69.90, -14.16) 07/31/2023   00:40:58  ( -69.91, -14.09)    2.73                46
 08/02/2023   15:17:14   ( -70.30, 126.38) 08/02/2023   15:18:26  ( -70.19, 126.93)   23.91                72
 08/02/2023   16:07:53   (  69.94, -65.76) 08/02/2023   16:07:55  (  69.97, -65.74)    3.13                 2
 08/02/2023   16:58:35   ( -69.83, 101.71) 08/02/2023   16:57:25  ( -69.86, 101.74)    3.33                70