Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 8 9.  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)
 08/09/2023   07:59:17   ( -70.01,-123.71) 08/09/2023   08:00:06  ( -70.00,-123.72)    1.10                49
 08/09/2023   08:50:01   (  69.89,  43.77) 08/09/2023   08:49:33  (  69.89,  43.78)    0.43                28
 08/09/2023   09:40:25   ( -68.85,-147.43) 08/09/2023   09:39:19  ( -68.90,-149.91)   99.73                66
 08/12/2023   00:16:08   ( -69.98,  -7.88) 08/12/2023   00:16:35  ( -69.96,  -7.88)    1.63                27
 08/12/2023   01:06:52   (  69.87, 159.59) 08/12/2023   01:06:02  (  69.85, 159.61)    1.36                50
 08/14/2023   15:42:19   (  70.21, -59.77) 08/14/2023   15:43:30  (  70.17, -59.33)   16.93                71
 08/14/2023   16:32:58   ( -69.96, 107.93) 08/14/2023   16:33:02  ( -69.95, 107.99)    2.34                 4
 08/14/2023   17:23:41   (  69.79, -84.52) 08/14/2023   17:22:30  (  69.79, -84.60)    3.09                71
 08/17/2023   07:59:06   (  69.99,  56.35) 08/17/2023   08:00:00  (  70.02,  56.34)    3.48                54
 08/17/2023   08:49:48   ( -69.89,-136.19) 08/17/2023   08:49:30  ( -69.91,-136.17)    2.48                18
 08/17/2023   09:40:18   (  69.04,  32.34) 08/17/2023   09:39:10  (  69.08,  30.35)   79.20                68
 08/20/2023   00:15:56   (  69.94, 172.21) 08/20/2023   00:16:28  (  69.95, 172.14)    3.19                32
 08/20/2023   01:06:38   ( -69.84, -20.33) 08/20/2023   01:05:58  ( -69.85, -20.37)    1.87                40
 08/22/2023   15:42:11   ( -70.47, 119.86) 08/22/2023   15:43:22  ( -70.36, 120.97)   43.21                71
 08/22/2023   16:32:47   (  69.95, -72.02) 08/22/2023   16:32:54  (  69.96, -71.95)    3.13                 7
 08/22/2023   17:23:28   ( -69.80,  95.52) 08/22/2023   17:22:25  ( -69.81,  95.47)    2.35                63