Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2017 12 26.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 12/28/2017   10:24:46   (  -0.04,-135.29) (  -0.03,-135.28)    1.77                80
 12/30/2017   22:27:55   (   0.04,-135.17) (  -0.16,-136.05)  100.52                80
 12/31/2017   22:11:50   (   0.03,-135.14) (   0.83,-131.51)  413.35                80
 01/02/2018   10:30:57   (  -0.04,-135.17) (   0.34,-136.78)  184.32                80
 01/03/2018   10:14:52   (  -0.03,-135.14) (  -0.66,-132.24)  329.28                80
 01/04/2018   22:34:07   (   0.04,-135.02) (  -0.52,-137.54)  287.59                80
 01/05/2018   22:18:02   (   0.04,-134.99) (   0.48,-133.01)  225.66                80
 01/07/2018   10:37:09   (  -0.05,-135.01) (   0.69,-138.28)  372.93                80
 01/08/2018   10:21:03   (  -0.04,-134.98) (  -0.30,-133.74)  140.38                80