Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 12 3.  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)
 12/04/2023   15:43:11   (  69.92, -59.67) 12/04/2023   15:43:54  (  69.94, -59.71)    2.43                43
 12/04/2023   16:33:53   ( -69.83, 107.79) 12/04/2023   16:33:24  ( -69.83, 107.76)    0.89                29
 12/07/2023   07:09:34   ( -70.65,-112.35) 12/07/2023   07:10:42  ( -70.56,-110.57)   66.70                68
 12/07/2023   08:00:06   (  69.91,  56.11) 12/07/2023   08:00:19  (  69.90,  56.13)    1.26                13
 12/07/2023   08:50:48   ( -69.81,-136.43) 12/07/2023   08:49:49  ( -69.79,-136.39)    2.91                59
 12/09/2023   23:26:17   ( -69.97,   4.49) 12/09/2023   23:27:17  ( -69.99,   4.51)    2.59                60
 12/10/2023   00:17:01   (  69.86, 171.96) 12/10/2023   00:16:44  (  69.88, 172.00)    2.40                17
 12/10/2023   01:07:33   ( -69.23, -19.81) 12/10/2023   01:06:23  ( -69.27, -21.19)   54.42                70
 12/12/2023   15:43:12   ( -69.93, 120.32) 12/12/2023   15:43:42  ( -69.93, 120.32)    0.27                30
 12/12/2023   16:33:56   (  69.82, -72.22) 12/12/2023   16:33:09  (  69.81, -72.20)    1.74                47
 12/15/2023   07:09:25   (  70.01,  68.65) 12/15/2023   07:10:36  (  69.98,  68.67)    2.92                71
 12/15/2023   08:00:07   ( -69.90,-123.88) 12/15/2023   08:00:06  ( -69.88,-123.85)    3.23                 1
 12/15/2023   08:50:47   (  69.59,  43.90) 12/15/2023   08:49:35  (  69.65,  43.48)   17.26                72