Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2016 12 13.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 12/14/2016   10:31:22   (  -0.04,-135.28) (   0.28,-136.84)  176.90                80
 12/15/2016   10:15:16   (  -0.03,-135.26) (  -0.69,-132.30)  337.66                80
 12/16/2016   22:34:32   (   0.04,-135.19) (  -0.52,-137.59)  274.30                80
 12/17/2016   22:18:27   (   0.03,-135.17) (   0.51,-133.07)  240.19                80
 12/19/2016   10:37:34   (  -0.05,-135.18) (   0.68,-138.33)  360.51                80
 12/20/2016   10:21:30   (  -0.04,-135.15) (  -0.35,-133.81)  153.70                80
 12/21/2016   22:40:45   (   0.06,-135.08) (  -0.85,-139.11)  458.88                80
 12/22/2016   22:24:41   (   0.05,-135.06) (   0.18,-134.58)   55.29                80
 12/25/2016   10:25:03   (  -0.05,-135.03) (   0.04,-135.31)   32.36                80
 12/26/2016   10:08:58   (  -0.04,-135.00) (  -1.00,-130.78)  481.21                80