Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 4 22.  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)
 04/24/2023   14:52:29   ( -70.91, 131.78) 04/24/2023   14:53:37  ( -70.77, 133.76)   73.89                68
 04/24/2023   15:42:59   (  70.06, -59.56) 04/24/2023   15:43:15  (  70.06, -59.63)    2.70                16
 04/24/2023   16:33:41   ( -69.98, 107.88) 04/24/2023   16:32:45  ( -69.95, 107.85)    3.34                56
 04/27/2023   07:09:04   ( -70.20,-111.29) 04/27/2023   07:10:15  ( -70.22,-111.19)    4.09                71
 04/27/2023   07:59:47   (  70.04,  56.27) 04/27/2023   07:59:43  (  70.05,  56.22)    2.37                 4
 04/27/2023   08:50:27   ( -69.85,-136.13) 04/27/2023   08:49:14  ( -69.89,-136.37)   10.49                73
 04/29/2023   23:25:52   ( -70.13,   4.61) 04/29/2023   23:26:45  ( -70.12,   4.55)    2.57                53
 04/30/2023   00:16:36   (  70.02, 172.08) 04/30/2023   00:16:12  (  70.01, 172.04)    2.36                24
 04/30/2023   01:07:03   ( -69.14, -19.32) 04/30/2023   01:05:55  ( -69.19, -21.44)   84.12                68
 05/02/2023   15:42:41   ( -70.12, 120.41) 05/02/2023   15:43:13  ( -70.10, 120.40)    2.30                32
 05/02/2023   16:33:25   (  70.02, -72.12) 05/02/2023   16:32:40  (  69.99, -72.12)    3.24                45
 05/05/2023   07:08:55   (  70.59,  68.16) 05/05/2023   07:10:05  (  70.48,  69.20)   40.32                70
 05/05/2023   07:59:29   ( -70.07,-123.72) 05/05/2023   07:59:41  ( -70.05,-123.79)    3.38                12
 05/05/2023   08:50:13   (  69.97,  43.75) 05/05/2023   08:49:07  (  69.99,  43.77)    2.55                66