Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 5 24.  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)
 05/26/2023   14:52:23   ( -70.14, 132.91) 05/26/2023   14:53:35  ( -70.14, 132.97)    2.16                72
 05/26/2023   15:43:07   (  70.02, -59.59) 05/26/2023   15:43:02  (  70.04, -59.53)    3.43                 5
 05/26/2023   16:33:47   ( -69.83, 108.01) 05/26/2023   16:32:33  ( -69.88, 107.87)    7.34                74
 05/29/2023   07:09:18   ( -70.11,-111.28) 05/29/2023   07:10:05  ( -70.10,-111.21)    2.99                47
 05/29/2023   08:00:02   (  69.99,  56.22) 05/29/2023   07:59:32  (  69.99,  56.28)    2.57                30
 05/31/2023   22:35:45   (  70.92,-164.11) 05/31/2023   22:36:52  (  70.85,-161.85)   82.88                67
 05/31/2023   23:26:12   ( -70.04,   4.60) 05/31/2023   23:26:35  ( -70.03,   4.57)    1.71                23
 06/01/2023   00:16:56   (  69.92, 172.09) 06/01/2023   00:16:02  (  69.92, 172.06)    1.02                54
 06/03/2023   14:52:24   (  70.12, -47.07) 06/03/2023   14:53:33  (  70.09, -47.08)    3.34                69
 06/03/2023   15:43:05   ( -69.97, 120.47) 06/03/2023   15:43:03  ( -69.99, 120.40)    2.74                 2
 06/03/2023   16:33:45   (  69.65, -71.74) 06/03/2023   16:32:33  (  69.71, -72.34)   24.05                72
 06/06/2023   07:09:18   (  70.07,  68.78) 06/06/2023   07:10:01  (  70.08,  68.79)    1.12                43
 06/06/2023   08:00:00   ( -69.97,-123.76) 06/06/2023   07:59:31  ( -69.97,-123.72)    1.37                29