Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 10 13.  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)
 10/15/2023   00:16:06   ( -69.95,  -7.92) 10/15/2023   00:16:55  ( -69.94,  -7.95)    2.10                49
 10/15/2023   01:06:50   (  69.84, 159.56) 10/15/2023   01:06:22  (  69.83, 159.54)    0.81                28
 10/17/2023   15:42:32   (  70.90, -60.96) 10/17/2023   15:43:38  (  70.83, -58.40)   93.77                66
 10/17/2023   16:32:57   ( -69.91, 107.92) 10/17/2023   16:33:23  ( -69.90, 107.87)    2.52                26
 10/17/2023   17:23:41   (  69.80, -84.61) 10/17/2023   17:22:50  (  69.79, -84.63)    1.81                51
 10/20/2023   07:59:09   (  70.09,  56.11) 10/20/2023   08:00:19  (  70.08,  56.39)   10.53                70
 10/20/2023   08:49:49   ( -69.89,-136.27) 10/20/2023   08:49:51  ( -69.87,-136.28)    3.12                 2
 10/20/2023   09:40:31   (  69.68,  31.36) 10/20/2023   09:39:19  (  69.70,  31.13)    9.05                72
 10/23/2023   00:15:58   (  69.93, 172.14) 10/23/2023   00:16:48  (  69.94, 172.08)    2.35                50
 10/23/2023   01:06:40   ( -69.83, -20.40) 10/23/2023   01:06:18  ( -69.84, -20.43)    1.29                22
 10/23/2023   01:57:07   (  68.82, 148.34) 10/23/2023   01:56:01  (  68.84, 145.89)   98.52                66
 10/25/2023   16:32:50   (  69.95, -72.10) 10/25/2023   16:33:14  (  69.92, -72.05)    3.27                24
 10/25/2023   17:23:31   ( -69.79,  95.45) 10/25/2023   17:22:44  ( -69.82,  95.44)    3.40                47