Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2017 7 3.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 07/04/2017   10:43:00   (  -0.12,-135.42) (   0.83,-139.67)  484.49                80
 07/05/2017   10:26:56   (  -0.11,-135.41) (  -0.20,-135.14)   31.32                80
 07/07/2017   22:27:26   (   0.13,-135.41) (  -0.01,-135.90)   56.98                80
 07/08/2017   22:11:22   (   0.12,-135.39) (   1.03,-131.37)  458.44                80
 07/10/2017   10:30:29   (  -0.14,-135.34) (   0.14,-136.64)  148.19                80
 07/11/2017   10:14:24   (  -0.13,-135.32) (  -0.84,-132.10)  366.59                80
 07/12/2017   22:33:41   (   0.16,-135.32) (  -0.29,-137.42)  238.54                80
 07/13/2017   22:17:36   (   0.15,-135.30) (   0.69,-132.88)  276.22                80
 07/15/2017   10:36:43   (  -0.17,-135.24) (   0.48,-138.14)  330.95                80
 07/16/2017   10:20:38   (  -0.16,-135.21) (  -0.50,-133.60)  183.09                80