Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 10 6.  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)
 10/07/2023   00:16:13   (  69.95, 172.06) 10/07/2023   00:16:51  (  69.93, 172.05)    2.31                38
 10/07/2023   01:06:54   ( -69.82, -20.42) 10/07/2023   01:06:21  ( -69.82, -20.47)    2.01                33
 10/09/2023   15:42:36   ( -70.77, 119.23) 10/09/2023   15:43:43  ( -70.68, 121.37)   79.19                67
 10/09/2023   16:33:06   (  69.92, -72.12) 10/09/2023   16:33:22  (  69.92, -72.09)    1.16                16
 10/09/2023   17:23:47   ( -69.78,  95.41) 10/09/2023   17:22:52  ( -69.82,  95.39)    3.49                55
 10/12/2023   07:59:13   ( -69.97,-123.72) 10/12/2023   08:00:25  ( -69.98,-123.78)    2.48                72
 10/12/2023   08:49:57   (  69.86,  43.76) 10/12/2023   08:49:52  (  69.87,  43.71)    2.25                 5
 10/12/2023   09:40:36   ( -69.61,-148.56) 10/12/2023   09:39:24  ( -69.65,-148.95)   16.03                72
 10/15/2023   00:16:06   ( -69.97,  -7.94) 10/15/2023   00:16:55  ( -69.94,  -7.95)    3.01                49
 10/15/2023   01:06:50   (  69.86, 159.53) 10/15/2023   01:06:22  (  69.83, 159.53)    3.53                28
 10/15/2023   01:57:14   ( -68.81, -31.66) 10/15/2023   01:56:08  ( -68.84, -34.14)   99.57                66
 10/17/2023   15:42:33   (  70.92, -60.99) 10/17/2023   15:43:39  (  70.83, -58.39)   95.21                66
 10/17/2023   16:32:58   ( -69.93, 107.90) 10/17/2023   16:33:24  ( -69.91, 107.89)    1.82                26
 10/17/2023   17:23:42   (  69.82, -84.63) 10/17/2023   17:22:51  (  69.79, -84.63)    3.22                51