Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 10 18.  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   07:59:09   (  70.08,  56.14) 10/20/2023   08:00:20  (  70.05,  56.33)    8.09                71
 10/20/2023   08:49:49   ( -69.88,-136.25) 10/20/2023   08:49:51  ( -69.88,-136.27)    0.69                 2
 10/20/2023   09:40:32   (  69.71,  31.30) 10/20/2023   09:39:19  (  69.72,  31.15)    5.86                73
 10/23/2023   00:15:59   (  69.96, 172.09) 10/23/2023   00:16:48  (  69.98, 172.13)    3.06                49
 10/23/2023   01:06:41   ( -69.87, -20.45) 10/23/2023   01:06:18  ( -69.87, -20.39)    2.55                23
 10/23/2023   01:57:07   (  68.80, 148.38) 10/23/2023   01:56:01  (  68.88, 145.94)   98.40                66
 10/25/2023   16:32:50   (  69.91, -72.05) 10/25/2023   16:33:15  (  69.94, -72.04)    2.81                25
 10/25/2023   17:23:32   ( -69.81,  95.41) 10/25/2023   17:22:45  ( -69.83,  95.45)    2.11                47
 10/28/2023   07:59:00   ( -70.19,-124.00) 10/28/2023   08:00:11  ( -70.13,-123.51)   19.26                71
 10/28/2023   08:49:40   (  69.88,  43.79) 10/28/2023   08:49:40  (  69.91,  43.81)    3.31                 0
 10/28/2023   09:40:22   ( -69.78,-148.75) 10/28/2023   09:39:10  ( -69.80,-148.70)    3.31                72
 10/31/2023   00:15:47   ( -69.95,  -7.85) 10/31/2023   00:16:39  ( -69.95,  -7.86)    0.56                52
 10/31/2023   01:06:31   (  69.86, 159.60) 10/31/2023   01:06:06  (  69.83, 159.61)    2.44                25