Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2017 12 30.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 12/30/2017   22:27:56   (   0.04,-135.17) (  -0.14,-136.05)  100.05                80
 12/31/2017   22:11:50   (   0.04,-135.14) (   0.86,-131.51)  414.01                80
 01/02/2018   10:30:58   (  -0.04,-135.17) (   0.31,-136.78)  183.60                80
 01/03/2018   10:14:52   (  -0.04,-135.14) (  -0.68,-132.25)  330.13                80
 01/04/2018   22:34:07   (   0.04,-135.03) (  -0.50,-137.55)  286.34                80
 01/05/2018   22:18:02   (   0.04,-135.00) (   0.49,-133.01)  227.09                80
 01/07/2018   10:37:09   (  -0.05,-135.02) (   0.67,-138.28)  371.36                80
 01/08/2018   10:21:04   (  -0.05,-134.99) (  -0.32,-133.75)  142.08                80
 01/09/2018   22:40:19   (   0.05,-134.88) (  -0.86,-139.05)  474.44                80
 01/10/2018   22:24:14   (   0.05,-134.85) (   0.14,-134.51)   38.68                80