Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 7 21.  Predictions up to the next  14.0 days:

     Date     Time(NOAA-21) NOAA-21 Lat/Lon Date Time(LANDSAT-8) LANDSAT-8 Lat/Lon    Distance(km)  Time Diff(sec)
 07/21/2023   15:42:43   ( -70.02, 120.43) 07/21/2023   15:43:28  ( -70.00, 120.41)    3.17                45
 07/21/2023   16:33:27   (  69.91, -72.10) 07/21/2023   16:32:55  (  69.90, -72.09)    1.93                32
 07/24/2023   07:09:10   (  70.98,  67.37) 07/24/2023   07:10:16  (  70.86,  69.92)   93.64                66
 07/24/2023   07:59:35   ( -69.99,-123.74) 07/24/2023   08:00:00  ( -69.98,-123.74)    0.47                25
 07/24/2023   08:50:19   (  69.88,  43.73) 07/24/2023   08:49:27  (  69.88,  43.76)    1.03                52
 07/26/2023   23:25:49   (  70.27,-175.71) 07/26/2023   23:26:59  (  70.21,-175.17)   20.94                70
 07/27/2023   00:16:27   ( -69.96,  -7.92) 07/27/2023   00:16:32  ( -69.94,  -7.92)    1.80                 5
 07/27/2023   01:07:11   (  69.85, 159.55) 07/27/2023   01:05:59  (  69.83, 159.57)    2.33                72
 07/29/2023   15:42:37   (  70.03, -59.57) 07/29/2023   15:43:33  (  70.03, -59.56)    0.93                56
 07/29/2023   16:33:19   ( -69.93, 107.90) 07/29/2023   16:33:03  ( -69.93, 107.93)    1.56                16
 07/29/2023   17:23:50   (  69.14, -83.65) 07/29/2023   17:22:41  (  69.20, -85.40)   69.74                69
 08/01/2023   07:59:27   (  69.97,  56.31) 08/01/2023   08:00:03  (  69.98,  56.26)    2.48                36
 08/01/2023   08:50:09   ( -69.86,-136.22) 08/01/2023   08:49:33  ( -69.88,-136.25)    2.22                36
 08/03/2023   23:25:48   ( -70.74,   3.57) 08/03/2023   23:26:56  ( -70.63,   5.43)   69.84                68
 08/04/2023   00:16:19   (  69.96, 172.10) 08/04/2023   00:16:33  (  69.96, 172.11)    0.50                14
 08/04/2023   01:07:01   ( -69.86, -20.43) 08/04/2023   01:06:03  ( -69.87, -20.39)    1.74                58