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   22:27:55   (   0.05,-135.17) (  -0.16,-136.05)  100.10                80
 12/31/2017   22:11:50   (   0.04,-135.14) (   0.84,-131.51)  413.96                80
 01/02/2018   10:30:57   (  -0.04,-135.17) (   0.33,-136.78)  183.73                80
 01/03/2018   10:14:52   (  -0.04,-135.14) (  -0.66,-132.24)  330.02                80
 01/04/2018   22:34:07   (   0.05,-135.03) (  -0.52,-137.54)  286.37                80
 01/05/2018   22:18:02   (   0.04,-135.00) (   0.47,-133.01)  227.07                80
 01/07/2018   10:37:09   (  -0.05,-135.02) (   0.69,-138.28)  371.44                80
 01/08/2018   10:21:03   (  -0.05,-134.99) (  -0.30,-133.74)  142.03                80
 01/09/2018   22:40:19   (   0.05,-134.88) (  -0.88,-139.04)  474.44                80
 01/10/2018   22:24:13   (   0.05,-134.85) (   0.12,-134.51)   38.62                80
 01/13/2018   10:24:35   (  -0.04,-134.82) (   0.05,-135.24)   47.97                80