Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 10 8.  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)
 10/09/2023   15:42:35   ( -70.77, 119.24) 10/09/2023   15:43:42  ( -70.69, 121.38)   79.03                67
 10/09/2023   16:33:05   (  69.92, -72.11) 10/09/2023   16:33:21  (  69.93, -72.08)    1.81                16
 10/09/2023   17:23:47   ( -69.83,  95.33) 10/09/2023   17:22:51  ( -69.82,  95.40)    2.99                56
 10/12/2023   07:59:13   ( -69.96,-123.71) 10/12/2023   08:00:25  ( -69.98,-123.78)    2.93                72
 10/12/2023   08:49:57   (  69.85,  43.77) 10/12/2023   08:49:52  (  69.87,  43.72)    3.24                 5
 10/12/2023   09:40:37   ( -69.66,-148.63) 10/12/2023   09:39:23  ( -69.71,-148.87)   11.18                74
 10/15/2023   00:16:06   ( -69.96,  -7.93) 10/15/2023   00:16:55  ( -69.94,  -7.96)    3.11                49
 10/15/2023   01:06:50   (  69.85, 159.54) 10/15/2023   01:06:22  (  69.82, 159.53)    2.97                28
 10/17/2023   15:42:33   (  70.91, -60.98) 10/17/2023   15:43:39  (  70.82, -58.40)   94.37                66
 10/17/2023   16:32:58   ( -69.92, 107.91) 10/17/2023   16:33:24  ( -69.90, 107.87)    2.74                26
 10/17/2023   17:23:42   (  69.81, -84.62) 10/17/2023   17:22:51  (  69.78, -84.64)    3.38                51
 10/20/2023   07:59:09   (  70.10,  56.10) 10/20/2023   08:00:19  (  70.08,  56.39)   11.24                70
 10/20/2023   08:49:49   ( -69.90,-136.27) 10/20/2023   08:49:51  ( -69.87,-136.28)    2.73                 2
 10/20/2023   09:40:31   (  69.69,  31.34) 10/20/2023   09:39:19  (  69.70,  31.13)    8.33                72