Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 10 11.  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)
 10/12/2023   07:59:13   ( -69.97,-123.72) 10/12/2023   08:00:25  ( -69.97,-123.79)    2.66                72
 10/12/2023   08:49:57   (  69.85,  43.76) 10/12/2023   08:49:52  (  69.87,  43.71)    2.67                 5
 10/12/2023   09:40:36   ( -69.61,-148.56) 10/12/2023   09:39:24  ( -69.64,-148.96)   16.08                72
 10/15/2023   00:16:06   ( -69.97,  -7.94) 10/15/2023   00:16:54  ( -69.98,  -7.90)    1.75                48
 10/15/2023   01:06:50   (  69.85, 159.54) 10/15/2023   01:06:21  (  69.87, 159.59)    2.70                29
 10/17/2023   15:42:33   (  70.92, -60.98) 10/17/2023   15:43:39  (  70.81, -58.43)   94.04                66
 10/17/2023   16:32:58   ( -69.93, 107.90) 10/17/2023   16:33:23  ( -69.94, 107.93)    1.41                25
 10/17/2023   17:23:42   (  69.82, -84.63) 10/17/2023   17:22:50  (  69.82, -84.58)    1.91                52
 10/20/2023   07:59:09   (  70.05,  56.17) 10/20/2023   08:00:21  (  70.01,  56.28)    6.61                72
 10/20/2023   08:49:50   ( -69.90,-136.28) 10/20/2023   08:49:51  ( -69.90,-136.23)    2.06                 1
 10/20/2023   09:40:31   (  69.69,  31.34) 10/20/2023   09:39:18  (  69.73,  31.18)    7.68                73
 10/23/2023   00:15:58   (  69.94, 172.12) 10/23/2023   00:16:48  (  69.93, 172.06)    3.02                50
 10/23/2023   01:06:40   ( -69.84, -20.41) 10/23/2023   01:06:18  ( -69.82, -20.45)    2.45                22