Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 7 18.  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)
 07/18/2023   23:25:51   ( -70.05,   4.62) 07/18/2023   23:26:58  ( -70.03,   4.57)    2.16                67
 07/19/2023   00:16:35   (  69.94, 172.09) 07/19/2023   00:16:25  (  69.93, 172.08)    0.73                10
 07/19/2023   01:07:11   ( -69.53, -19.99) 07/19/2023   01:05:59  ( -69.60, -20.75)   30.62                72
 07/21/2023   15:42:43   ( -70.00, 120.46) 07/21/2023   15:43:27  ( -69.99, 120.41)    2.11                44
 07/21/2023   16:33:27   (  69.90, -72.07) 07/21/2023   16:32:54  (  69.89, -72.09)    1.12                33
 07/24/2023   07:09:07   (  70.80,  67.66) 07/24/2023   07:10:14  (  70.70,  69.69)   75.65                67
 07/24/2023   07:59:35   ( -69.97,-123.71) 07/24/2023   07:59:55  ( -69.98,-123.71)    2.16                20
 07/24/2023   08:50:19   (  69.86,  43.76) 07/24/2023   08:49:22  (  69.88,  43.78)    1.69                57
 07/26/2023   23:25:45   (  70.04,-175.36) 07/26/2023   23:26:53  (  70.05,-175.36)    1.73                68
 07/27/2023   00:16:27   ( -69.94,  -7.89) 07/27/2023   00:16:23  ( -69.95,  -7.87)    1.46                 4
 07/27/2023   01:07:06   (  69.57, 159.96) 07/27/2023   01:05:54  (  69.62, 159.31)   25.74                72
 07/29/2023   15:42:36   (  70.02, -59.55) 07/29/2023   15:43:20  (  69.99, -59.55)    3.43                44
 07/29/2023   16:33:18   ( -69.92, 107.92) 07/29/2023   16:32:50  ( -69.89, 107.93)    3.23                28