Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 6 25.  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)
 06/27/2023   14:52:31   ( -70.85, 131.76) 06/27/2023   14:53:38  ( -70.77, 133.90)   78.85                67
 06/27/2023   15:43:01   (  70.01, -59.60) 06/27/2023   15:43:17  (  70.01, -59.57)    1.14                16
 06/27/2023   16:33:43   ( -69.92, 107.86) 06/27/2023   16:32:47  ( -69.90, 107.91)    2.44                56
 06/30/2023   07:09:10   ( -70.07,-111.23) 06/30/2023   07:10:22  ( -70.07,-111.26)    1.15                72
 06/30/2023   07:59:54   (  69.97,  56.24) 06/30/2023   07:59:49  (  69.96,  56.24)    0.31                 5
 06/30/2023   08:50:33   ( -69.71,-136.06) 06/30/2023   08:49:21  ( -69.75,-136.43)   14.68                72
 07/02/2023   23:26:03   ( -70.04,   4.60) 07/02/2023   23:26:53  ( -70.04,   4.58)    1.02                50
 07/03/2023   00:16:47   (  69.93, 172.06) 07/03/2023   00:16:20  (  69.93, 172.07)    0.44                27
 07/03/2023   01:07:12   ( -68.93, -19.18) 07/03/2023   01:06:05  ( -69.00, -21.54)   94.45                67
 07/05/2023   15:42:56   ( -70.01, 120.42) 07/05/2023   15:43:24  ( -69.98, 120.38)    3.19                28
 07/05/2023   16:33:40   (  69.91, -72.12) 07/05/2023   16:32:50  (  69.92, -72.06)    3.08                50
 07/08/2023   07:09:09   (  70.25,  68.50) 07/08/2023   07:10:20  (  70.20,  68.94)   17.43                71
 07/08/2023   07:59:48   ( -69.98,-123.77) 07/08/2023   07:59:52  ( -69.99,-123.72)    2.11                 4
 07/08/2023   08:50:31   (  69.84,  43.76) 07/08/2023   08:49:20  (  69.82,  43.68)    3.28                71