Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 5 9.  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)
 05/10/2023   14:52:22   ( -70.34, 132.66) 05/10/2023   14:53:34  ( -70.27, 133.01)   15.14                72
 05/10/2023   15:43:03   (  70.05, -59.60) 05/10/2023   15:43:03  (  70.06, -59.65)    2.06                 0
 05/10/2023   16:33:45   ( -69.97, 107.85) 05/10/2023   16:32:32  ( -70.00, 107.90)    3.38                73
 05/13/2023   07:09:15   ( -70.16,-111.30) 05/13/2023   07:10:02  ( -70.13,-111.31)    3.33                47
 05/13/2023   07:59:59   (  70.03,  56.20) 05/13/2023   07:59:29  (  70.02,  56.18)    1.74                30
 05/15/2023   22:35:40   (  70.81,-163.89) 05/15/2023   22:36:48  (  70.72,-162.19)   63.18                68
 05/15/2023   23:26:10   ( -70.09,   4.57) 05/15/2023   23:26:27  ( -70.11,   4.56)    2.89                17
 05/16/2023   00:16:55   (  70.02, 171.98) 05/16/2023   00:15:54  (  70.00, 172.05)    3.38                61
 05/18/2023   14:52:23   (  70.17, -47.12) 05/18/2023   14:53:21  (  70.18, -47.09)    1.32                58
 05/18/2023   15:43:05   ( -70.08, 120.34) 05/18/2023   15:42:51  ( -70.07, 120.39)    2.43                14
 05/18/2023   16:33:37   (  69.33, -71.25) 05/18/2023   16:32:28  (  69.40, -72.88)   64.49                69
 05/21/2023   07:09:18   (  70.13,  68.71) 05/21/2023   07:09:46  (  70.10,  68.70)    2.83                28
 05/21/2023   07:59:59   ( -69.98,-123.75) 05/21/2023   07:59:16  ( -70.00,-123.82)    3.19                43