Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 9 5.  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   ( -70.23, 120.13) 09/07/2023   15:43:40  ( -70.13, 120.59)   21.02                72
 09/07/2023   16:33:08   (  69.89, -72.05) 09/07/2023   16:33:09  (  69.91, -72.07)    2.34                 1
 09/07/2023   17:23:50   ( -69.81,  95.39) 09/07/2023   17:22:39  ( -69.80,  95.41)    1.85                71
 09/10/2023   07:59:19   ( -69.96,-123.70) 09/10/2023   08:00:10  ( -69.97,-123.74)    1.91                51
 09/10/2023   08:50:04   (  69.89,  43.72) 09/10/2023   08:49:37  (  69.87,  43.76)    3.08                27
 09/10/2023   09:40:29   ( -68.91,-147.56) 09/10/2023   09:39:22  ( -68.93,-149.86)   92.00                67
 09/12/2023   23:25:48   (  70.84,-176.64) 09/12/2023   23:26:55  (  70.73,-174.37)   83.76                67
 09/13/2023   00:16:15   ( -69.96,  -7.94) 09/13/2023   00:16:37  ( -69.96,  -7.86)    2.85                22
 09/13/2023   01:06:59   (  69.84, 159.55) 09/13/2023   01:06:04  (  69.85, 159.63)    2.93                55
 09/15/2023   15:42:28   (  70.01, -59.56) 09/15/2023   15:43:34  (  70.03, -59.50)    2.85                66
 09/15/2023   16:33:09   ( -69.87, 107.97) 09/15/2023   16:33:05  ( -69.87, 107.90)    2.69                 4
 09/15/2023   17:23:47   (  69.48, -84.16) 09/15/2023   17:22:35  (  69.53, -84.91)   29.87                72
 09/18/2023   07:59:22   (  69.98,  56.25) 09/18/2023   08:00:00  (  69.96,  56.30)    2.52                38
 09/18/2023   08:50:03   ( -69.84,-136.21) 09/18/2023   08:49:30  ( -69.86,-136.21)    2.52                33