Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 10 12.  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   07:59:14   ( -69.99,-123.76) 10/12/2023   08:00:25  ( -70.00,-123.75)    0.64                71
 10/12/2023   08:49:58   (  69.87,  43.73) 10/12/2023   08:49:52  (  69.90,  43.75)    2.74                 6
 10/12/2023   09:40:37   ( -69.63,-148.60) 10/12/2023   09:39:24  ( -69.67,-148.92)   13.45                73
 10/15/2023   00:16:05   ( -69.94,  -7.90) 10/15/2023   00:16:54  ( -69.95,  -7.94)    1.71                49
 10/15/2023   01:06:49   (  69.83, 159.58) 10/15/2023   01:06:21  (  69.84, 159.56)    2.04                28
 10/17/2023   15:42:32   (  70.89, -60.94) 10/17/2023   15:43:38  (  70.83, -58.39)   93.36                66
 10/17/2023   16:32:57   ( -69.90, 107.93) 10/17/2023   16:33:23  ( -69.90, 107.88)    2.05                26
 10/17/2023   17:23:41   (  69.79, -84.59) 10/17/2023   17:22:50  (  69.79, -84.63)    1.36                51
 10/20/2023   07:59:09   (  70.09,  56.12) 10/20/2023   08:00:19  (  70.08,  56.38)    9.97                70
 10/20/2023   08:49:49   ( -69.89,-136.26) 10/20/2023   08:49:51  ( -69.86,-136.29)    2.83                 2
 10/20/2023   09:40:31   (  69.67,  31.37) 10/20/2023   09:39:19  (  69.69,  31.12)    9.62                72
 10/23/2023   00:15:58   (  69.93, 172.14) 10/23/2023   00:16:48  (  69.93, 172.07)    2.84                50
 10/23/2023   01:06:40   ( -69.83, -20.39) 10/23/2023   01:06:18  ( -69.83, -20.44)    1.99                22
 10/25/2023   16:32:48   (  69.90, -72.02) 10/25/2023   16:33:13  (  69.90, -72.08)    2.23                25
 10/25/2023   17:23:30   ( -69.79,  95.45) 10/25/2023   17:22:43  ( -69.80,  95.41)    1.55                47