Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2017 7 11.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 07/12/2017   22:33:40   (   0.16,-135.32) (  -0.33,-137.40)  238.18                80
 07/13/2017   22:17:36   (   0.15,-135.30) (   0.71,-132.88)  276.60                80
 07/15/2017   10:36:43   (  -0.17,-135.23) (   0.45,-138.15)  331.41                80
 07/16/2017   10:20:38   (  -0.16,-135.21) (  -0.52,-133.60)  182.60                80
 07/17/2017   22:39:54   (   0.18,-135.19) (  -0.66,-138.91)  423.58                80
 07/18/2017   22:23:49   (   0.18,-135.16) (   0.32,-134.37)   90.24                80
 07/21/2017   10:26:51   (  -0.19,-135.05) (  -0.19,-135.11)    5.97                80
 07/23/2017   22:27:22   (   0.21,-134.99) (   0.00,-135.87)  100.91                80
 07/24/2017   22:11:17   (   0.20,-134.95) (   0.99,-131.33)  412.13                80