Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 12 5.  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)
 12/07/2023   07:09:34   ( -70.64,-112.34) 12/07/2023   07:10:43  ( -70.51,-110.64)   64.45                69
 12/07/2023   08:00:06   (  69.90,  56.13) 12/07/2023   08:00:19  (  69.91,  56.15)    1.82                13
 12/07/2023   08:50:48   ( -69.80,-136.41) 12/07/2023   08:49:49  ( -69.80,-136.38)    1.28                59
 12/09/2023   23:26:17   ( -69.95,   4.51) 12/09/2023   23:27:18  ( -69.95,   4.46)    1.97                61
 12/10/2023   00:17:01   (  69.85, 171.98) 12/10/2023   00:16:45  (  69.84, 171.95)    1.19                16
 12/10/2023   01:07:33   ( -69.22, -19.79) 12/10/2023   01:06:23  ( -69.29, -21.16)   54.66                70
 12/12/2023   15:43:12   ( -69.91, 120.34) 12/12/2023   15:43:43  ( -69.91, 120.29)    2.00                31
 12/12/2023   16:33:56   (  69.80, -72.19) 12/12/2023   16:33:10  (  69.80, -72.22)    1.45                46
 12/15/2023   07:09:25   (  70.03,  68.61) 12/15/2023   07:10:36  (  69.99,  68.68)    5.06                71
 12/15/2023   08:00:06   ( -69.88,-123.84) 12/15/2023   08:00:06  ( -69.88,-123.84)    0.91                 0
 12/15/2023   08:50:47   (  69.61,  43.86) 12/15/2023   08:49:35  (  69.66,  43.49)   15.20                72
 12/17/2023   23:26:19   (  69.96,-175.51) 12/17/2023   23:27:00  (  69.93,-175.51)    3.37                41
 12/18/2023   00:17:00   ( -69.80,  -7.95) 12/18/2023   00:16:30  ( -69.82,  -8.02)    3.46                30