Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 1 1.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 01/02/2018   10:30:57   (  -0.04,-135.17) (   0.33,-136.78)  183.88                80
 01/03/2018   10:14:52   (  -0.04,-135.14) (  -0.67,-132.24)  329.87                80
 01/04/2018   22:34:07   (   0.05,-135.03) (  -0.52,-137.54)  286.17                80
 01/05/2018   22:18:02   (   0.04,-135.00) (   0.48,-133.01)  227.29                80
 01/07/2018   10:37:09   (  -0.05,-135.02) (   0.69,-138.28)  371.46                80
 01/08/2018   10:21:04   (  -0.05,-134.99) (  -0.31,-133.74)  142.02                80
 01/09/2018   22:40:19   (   0.05,-134.88) (  -0.88,-139.04)  474.14                80
 01/10/2018   22:24:13   (   0.05,-134.85) (   0.12,-134.51)   38.94                80
 01/13/2018   10:24:35   (  -0.04,-134.82) (   0.05,-135.24)   47.85                80
 01/14/2018   10:08:30   (  -0.03,-134.78) (  -0.95,-130.70)  464.86                80