Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 12 28.  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)
 12/28/2023   15:43:13   ( -69.96, 120.27) 12/28/2023   15:43:57  ( -69.95, 120.27)    0.41                44
 12/28/2023   16:33:57   (  69.84, -72.24) 12/28/2023   16:33:24  (  69.85, -72.23)    1.29                33
 12/31/2023   07:09:37   (  70.64,  67.65) 12/31/2023   07:10:45  (  70.56,  69.40)   65.23                68
 12/31/2023   08:00:07   ( -69.92,-123.90) 12/31/2023   08:00:25  ( -69.90,-123.92)    2.93                18
 12/31/2023   08:50:51   (  69.81,  43.58) 12/31/2023   08:49:52  (  69.79,  43.58)    1.97                59
 01/02/2024   23:26:19   (  69.99,-175.54) 01/02/2024   23:27:22  (  69.97,-175.56)    2.36                63
 01/03/2024   00:17:00   ( -69.85,  -8.01) 01/03/2024   00:16:52  ( -69.86,  -8.08)    2.94                 8
 01/03/2024   01:07:36   (  69.31, 160.08) 01/03/2024   01:06:26  (  69.36, 158.89)   47.32                70
 01/05/2024   15:43:12   (  69.92, -59.67) 01/05/2024   15:43:48  (  69.95, -59.69)    3.04                36
 01/05/2024   16:33:54   ( -69.83, 107.78) 01/05/2024   16:33:18  ( -69.85, 107.79)    1.32                36
 01/08/2024   07:09:29   ( -70.45,-112.02) 01/08/2024   07:10:40  ( -70.34,-110.88)   44.24                71
 01/08/2024   08:00:05   (  69.92,  56.11) 01/08/2024   08:00:13  (  69.90,  56.13)    2.91                 8
 01/08/2024   08:50:46   ( -69.78,-136.35) 01/08/2024   08:49:43  ( -69.79,-136.38)    2.13                63
 01/10/2024   23:26:14   ( -69.99,   4.48) 01/10/2024   23:27:11  ( -69.99,   4.50)    0.80                57
 01/11/2024   00:16:58   (  69.88, 171.96) 01/11/2024   00:16:38  (  69.86, 171.98)    1.76                20