Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 7 21.  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)
 07/22/2023   23:51:09   ( -70.00,  -1.65) 07/22/2023   23:51:35  ( -70.01,  -1.63)    1.42                26
 07/23/2023   00:41:53   (  69.89, 165.83) 07/23/2023   00:41:02  (  69.91, 165.88)    3.04                51
 07/25/2023   15:17:21   (  70.17, -53.44) 07/25/2023   15:18:33  (  70.11, -53.22)   10.30                72
 07/25/2023   16:08:01   ( -69.97, 114.18) 07/25/2023   16:08:04  ( -69.94, 114.17)    2.36                 3
 07/25/2023   16:58:44   (  69.81, -78.27) 07/25/2023   16:57:31  (  69.84, -78.33)    4.42                73
 07/28/2023   07:34:11   (  70.04,  62.53) 07/28/2023   07:35:02  (  70.02,  62.53)    2.32                51
 07/28/2023   08:24:52   ( -69.89,-129.92) 07/28/2023   08:24:32  ( -69.91,-129.99)    3.44                20
 07/28/2023   09:15:20   (  68.93,  38.75) 07/28/2023   09:14:14  (  68.97,  36.40)   94.11                66
 07/30/2023   23:51:02   (  70.02, 178.34) 07/30/2023   23:51:28  (  70.00, 178.41)    3.37                26
 07/31/2023   00:41:43   ( -69.87, -14.11) 07/31/2023   00:40:58  ( -69.89, -14.11)    3.03                45
 08/02/2023   15:17:14   ( -70.32, 126.35) 08/02/2023   15:18:25  ( -70.24, 127.00)   25.90                71
 08/02/2023   16:07:53   (  69.96, -65.79) 08/02/2023   16:07:55  (  69.96, -65.75)    1.26                 2
 08/02/2023   16:58:35   ( -69.85, 101.68) 08/02/2023   16:57:25  ( -69.85, 101.73)    1.74                70