Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NOAA-21
TLE Epoch: 2023 12 13.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NOAA-21 Lat/Lon    Distance(km)  Time Diff(sec)
 12/14/2023   20:38:36   (   0.00,-104.66) (  -0.99,-108.99)  494.36                80
 12/15/2023   20:22:32   (   0.01,-104.66) (   0.07,-104.47)   22.09                80
 12/18/2023   08:25:36   (  -0.01,-104.69) (   0.09,-105.21)   59.59                80
 12/19/2023   08:04:12   (  -0.01,-104.69) (  -0.93,-100.68)  456.90                80
 12/20/2023   20:26:08   (   0.01,-104.66) (  -0.27,-105.98)  149.98                80
 12/21/2023   20:10:04   (   0.01,-104.67) (   0.75,-101.45)  366.73                80
 12/23/2023   08:31:52   (  -0.02,-104.70) (   0.42,-106.73)  230.63                80
 12/24/2023   08:10:27   (  -0.02,-104.70) (  -0.60,-102.20)  285.75                80
 12/25/2023   20:32:24   (   0.03,-104.67) (  -0.58,-107.50)  321.70                80
 12/26/2023   20:16:19   (   0.03,-104.67) (   0.44,-102.97)  194.88                80