Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 5 11.  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   07:10:02  ( -70.13,-111.30)    1.47                47
 05/13/2023   07:59:59   (  70.02,  56.22) 05/13/2023   07:59:29  (  70.03,  56.20)    1.23                30
 05/15/2023   22:35:39   (  70.80,-163.88) 05/15/2023   22:36:48  (  70.67,-162.26)   60.98                69
 05/15/2023   23:26:10   ( -70.14,   4.50) 05/15/2023   23:26:26  ( -70.11,   4.56)    3.42                16
 05/16/2023   00:16:54   (  70.01, 171.99) 05/16/2023   00:15:53  (  70.01, 172.05)    2.55                61
 05/18/2023   14:52:23   (  70.17, -47.12) 05/18/2023   14:53:21  (  70.17, -47.10)    0.70                58
 05/18/2023   15:43:05   ( -70.08, 120.34) 05/18/2023   15:42:51  ( -70.06, 120.38)    3.02                14
 05/18/2023   16:33:37   (  69.33, -71.24) 05/18/2023   16:32:28  (  69.40, -72.88)   64.84                69
 05/21/2023   07:09:18   (  70.14,  68.70) 05/21/2023   07:09:45  (  70.14,  68.75)    1.75                27
 05/21/2023   08:00:00   ( -70.05,-123.84) 05/21/2023   07:59:15  ( -70.03,-123.77)    3.18                45
 05/23/2023   22:35:30   ( -70.28,  16.94) 05/23/2023   22:36:41  ( -70.24,  17.15)    8.69                71
 05/23/2023   23:26:12   (  70.06,-175.41) 05/23/2023   23:26:09  (  70.07,-175.45)    1.78                 3
 05/24/2023   00:16:53   ( -69.91,  -7.88) 05/24/2023   00:15:40  ( -69.91,  -8.04)    6.30                73