Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 5 16.  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)
 05/18/2023   14:52:24   (  70.21, -47.17) 05/18/2023   14:53:29  (  70.18, -47.11)    3.22                65
 05/18/2023   15:43:05   ( -70.07, 120.36) 05/18/2023   15:42:59  ( -70.07, 120.36)    0.16                 6
 05/18/2023   16:33:43   (  69.63, -71.68) 05/18/2023   16:32:31  (  69.69, -72.52)   33.55                72
 05/21/2023   07:09:18   (  70.10,  68.75) 05/21/2023   07:09:57  (  70.12,  68.68)    3.40                39
 05/21/2023   08:00:00   ( -70.02,-123.80) 05/21/2023   07:59:27  ( -70.01,-123.85)    1.96                33
 05/23/2023   22:35:40   ( -70.76,  16.17) 05/23/2023   22:36:49  ( -70.64,  17.66)   56.40                69
 05/23/2023   23:26:14   (  70.12,-175.50) 05/23/2023   23:26:24  (  70.09,-175.49)    3.26                10
 05/24/2023   00:16:55   ( -69.97,  -7.97) 05/24/2023   00:15:54  ( -69.98,  -8.01)    1.61                61
 05/26/2023   14:52:24   ( -70.20, 132.83) 05/26/2023   14:53:22  ( -70.20, 132.90)    2.73                58
 05/26/2023   15:43:08   (  70.08, -59.69) 05/26/2023   15:42:49  (  70.08, -59.61)    2.74                19
 05/26/2023   16:33:38   ( -69.36, 108.70) 05/26/2023   16:32:29  ( -69.43, 107.12)   62.39                69
 05/29/2023   07:09:18   ( -70.11,-111.28) 05/29/2023   07:09:49  ( -70.11,-111.33)    1.89                31
 05/29/2023   08:00:02   (  70.00,  56.20) 05/29/2023   07:59:16  (  70.00,  56.15)    1.90                46