Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 12 22.  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)
 12/23/2023   07:09:41   ( -70.85,-112.69) 12/23/2023   07:10:48  ( -70.72,-110.37)   86.15                67
 12/23/2023   08:00:09   (  69.90,  56.12) 12/23/2023   08:00:28  (  69.90,  56.08)    1.73                19
 12/23/2023   08:50:51   ( -69.81,-136.43) 12/23/2023   08:49:58  ( -69.79,-136.44)    1.71                53
 12/25/2023   23:26:20   ( -70.01,   4.42) 12/25/2023   23:27:30  ( -69.98,   4.43)    3.29                70
 12/26/2023   00:17:04   (  69.89, 171.90) 12/26/2023   00:16:57  (  69.87, 171.92)    2.74                 7
 12/26/2023   01:07:42   ( -69.59, -20.33) 12/26/2023   01:06:29  ( -69.65, -20.75)   17.40                73
 12/28/2023   15:43:14   ( -69.96, 120.27) 12/28/2023   15:43:58  ( -69.97, 120.30)    1.60                44
 12/28/2023   16:33:58   (  69.85, -72.26) 12/28/2023   16:33:25  (  69.86, -72.21)    1.88                33
 12/31/2023   07:09:37   (  70.65,  67.64) 12/31/2023   07:10:45  (  70.58,  69.44)   66.67                68
 12/31/2023   08:00:07   ( -69.92,-123.90) 12/31/2023   08:00:25  ( -69.93,-123.87)    1.24                18
 12/31/2023   08:50:51   (  69.81,  43.57) 12/31/2023   08:49:52  (  69.81,  43.61)    1.48                59
 01/02/2024   23:26:19   (  69.99,-175.55) 01/02/2024   23:27:22  (  70.01,-175.50)    2.41                63
 01/03/2024   00:17:00   ( -69.85,  -8.01) 01/03/2024   00:16:53  ( -69.85,  -8.09)    3.11                 7
 01/03/2024   01:07:37   (  69.36, 160.00) 01/03/2024   01:06:26  (  69.40, 158.94)   41.65                71