Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 10 20.  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)
 10/20/2023   07:59:12   (  69.99,  56.25) 10/20/2023   08:00:22  (  69.97,  56.22)    2.47                70
 10/20/2023   08:49:54   ( -69.90,-136.30) 10/20/2023   08:49:51  ( -69.91,-136.23)    3.19                 3
 10/20/2023   09:40:34   (  69.56,  31.51) 10/20/2023   09:39:22  (  69.59,  30.97)   21.00                72
 10/23/2023   00:16:12   (  69.97, 172.03) 10/23/2023   00:16:53  (  69.97, 172.09)    2.48                41
 10/23/2023   01:06:53   ( -69.82, -20.44) 10/23/2023   01:06:24  ( -69.81, -20.50)    2.92                29
 10/25/2023   15:42:39   ( -70.65, 119.40) 10/25/2023   15:43:48  ( -70.53, 121.14)   65.60                69
 10/25/2023   16:33:11   (  69.90, -72.13) 10/25/2023   16:33:24  (  69.93, -72.09)    3.37                13
 10/25/2023   17:23:53   ( -69.81,  95.33) 10/25/2023   17:22:54  ( -69.83,  95.40)    3.44                59
 10/28/2023   07:59:25   ( -69.96,-123.77) 10/28/2023   08:00:27  ( -69.97,-123.80)    1.49                62
 10/28/2023   08:50:09   (  69.85,  43.71) 10/28/2023   08:49:54  (  69.85,  43.68)    1.13                15
 10/28/2023   09:40:42   ( -69.27,-148.14) 10/28/2023   09:39:32  ( -69.31,-149.42)   50.47                70
 10/31/2023   00:16:24   ( -69.90,  -7.94) 10/31/2023   00:16:57  ( -69.91,  -8.01)    2.59                33
 10/31/2023   01:07:08   (  69.80, 159.53) 10/31/2023   01:06:24  (  69.79, 159.48)    2.36                44
 11/02/2023   15:42:43   (  70.07, -59.76) 11/02/2023   15:43:54  (  70.07, -59.53)    8.70                71
 11/02/2023   16:33:23   ( -69.86, 107.88) 11/02/2023   16:33:26  ( -69.86, 107.81)    2.63                 3
 11/02/2023   17:24:06   (  69.70, -84.57) 11/02/2023   17:22:53  (  69.74, -84.71)    6.75                73