Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2020 12 15.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 12/15/2020   10:20:32   (  -0.00,-137.23) (  -0.78,-133.73)  399.14                80
 12/16/2020   22:39:50   (   0.00,-137.23) (  -0.39,-139.04)  206.27                80
 12/17/2020   22:23:45   (  -0.00,-137.23) (   0.62,-134.51)  309.99                80
 12/19/2020   10:42:53   (  -0.00,-137.23) (   0.54,-139.79)  290.50                80
 12/20/2020   10:26:49   (  -0.00,-137.23) (  -0.47,-135.26)  225.64                80
 12/21/2020   22:46:05   (   0.01,-137.22) (  -0.75,-140.56)  380.23                80
 12/22/2020   22:30:01   (   0.00,-137.22) (   0.25,-136.03)  135.73                80
 12/24/2020   10:49:09   (  -0.00,-137.22) (   0.90,-141.30)  465.26                80
 12/25/2020   10:33:05   (   0.00,-137.21) (  -0.11,-136.77)   50.36                80
 12/27/2020   22:33:36   (  -0.01,-137.18) (  -0.10,-137.54)   41.42                80
 12/28/2020   22:17:32   (  -0.01,-137.17) (   0.91,-133.01)  473.39                80