Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2017 12 27.  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)    1.72                80
 12/30/2017   22:27:55   (   0.04,-135.17) (  -0.16,-136.05)  100.29                80
 12/31/2017   22:11:50   (   0.03,-135.14) (   0.83,-131.51)  413.65                80
 01/02/2018   10:30:57   (  -0.04,-135.17) (   0.34,-136.78)  183.98                80
 01/03/2018   10:14:52   (  -0.03,-135.14) (  -0.66,-132.24)  329.67                80
 01/04/2018   22:34:07   (   0.04,-135.03) (  -0.52,-137.54)  287.09                80
 01/05/2018   22:18:02   (   0.04,-134.99) (   0.47,-133.01)  226.22                80
 01/07/2018   10:37:09   (  -0.05,-135.01) (   0.70,-138.28)  372.30                80
 01/08/2018   10:21:03   (  -0.04,-134.98) (  -0.30,-133.74)  141.07                80
 01/09/2018   22:40:19   (   0.05,-134.87) (  -0.88,-139.04)  475.69                80