Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 5 13.  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)
 05/13/2023   07:09:15   ( -70.15,-111.28) 05/13/2023   07:10:03  ( -70.17,-111.25)    3.30                48
 05/13/2023   07:59:59   (  70.02,  56.22) 05/13/2023   07:59:31  (  70.02,  56.17)    1.70                28
 05/15/2023   22:35:42   (  70.95,-164.13) 05/15/2023   22:36:49  (  70.88,-161.97)   79.19                67
 05/15/2023   23:26:09   ( -70.08,   4.58) 05/15/2023   23:26:31  ( -70.11,   4.53)    3.28                22
 05/16/2023   00:16:54   (  70.01, 172.00) 05/16/2023   00:15:58  (  70.00, 172.03)    1.51                56
 05/18/2023   14:52:23   (  70.16, -47.10) 05/18/2023   14:53:29  (  70.17, -47.14)    1.39                66
 05/18/2023   15:43:05   ( -70.08, 120.35) 05/18/2023   15:42:59  ( -70.06, 120.34)    2.09                 6
 05/18/2023   16:33:42   (  69.58, -71.61) 05/18/2023   16:32:31  (  69.67, -72.55)   37.53                71
 05/21/2023   07:09:18   (  70.12,  68.73) 05/21/2023   07:09:56  (  70.14,  68.71)    2.48                38
 05/21/2023   08:00:00   ( -70.03,-123.82) 05/21/2023   07:59:26  ( -70.04,-123.81)    0.50                34
 05/23/2023   22:35:39   ( -70.73,  16.22) 05/23/2023   22:36:48  ( -70.64,  17.67)   54.02                69
 05/23/2023   23:26:13   (  70.09,-175.46) 05/23/2023   23:26:23  (  70.08,-175.49)    1.42                10
 05/24/2023   00:16:55   ( -70.00,  -8.00) 05/24/2023   00:15:53  ( -69.98,  -8.01)    2.04                62
 05/26/2023   14:52:23   ( -70.18, 132.86) 05/26/2023   14:53:21  ( -70.16, 132.86)    1.38                58
 05/26/2023   15:43:07   (  70.07, -59.66) 05/26/2023   15:42:48  (  70.05, -59.66)    2.15                19