Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 9 6.  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)
 09/07/2023   15:42:28   ( -70.21, 120.16) 09/07/2023   15:43:40  ( -70.15, 120.62)   18.52                72
 09/07/2023   16:33:09   (  69.92, -72.09) 09/07/2023   16:33:09  (  69.94, -72.03)    2.89                 0
 09/07/2023   17:23:50   ( -69.79,  95.42) 09/07/2023   17:22:40  ( -69.77,  95.36)    3.40                70
 09/10/2023   07:59:20   ( -69.99,-123.74) 09/10/2023   08:00:10  ( -70.00,-123.70)    1.50                50
 09/10/2023   08:50:04   (  69.86,  43.76) 09/10/2023   08:49:37  (  69.89,  43.79)    3.20                27
 09/10/2023   09:40:29   ( -68.88,-147.52) 09/10/2023   09:39:22  ( -68.95,-149.83)   92.46                67
 09/12/2023   23:25:48   (  70.86,-176.68) 09/12/2023   23:26:54  (  70.75,-174.34)   86.62                66
 09/13/2023   00:16:14   ( -69.94,  -7.90) 09/13/2023   00:16:37  ( -69.93,  -7.91)    1.08                23
 09/13/2023   01:06:58   (  69.82, 159.59) 09/13/2023   01:06:04  (  69.82, 159.59)    0.56                54
 09/15/2023   15:42:27   (  69.98, -59.52) 09/15/2023   15:43:34  (  70.00, -59.54)    2.40                67
 09/15/2023   16:33:09   ( -69.89, 107.93) 09/15/2023   16:33:04  ( -69.89, 107.94)    0.19                 5
 09/15/2023   17:23:47   (  69.46, -84.11) 09/15/2023   17:22:36  (  69.50, -84.95)   32.98                71
 09/18/2023   07:59:22   (  69.95,  56.30) 09/18/2023   08:00:01  (  69.94,  56.26)    1.77                39
 09/18/2023   08:50:04   ( -69.86,-136.25) 09/18/2023   08:49:31  ( -69.83,-136.25)    2.78                33