Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2017 6 29.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 06/30/2017   10:20:41   (  -0.08,-135.44) (  -0.49,-133.62)  206.34                80
 07/01/2017   22:39:58   (   0.11,-135.47) (  -0.65,-138.94)  395.36                80
 07/02/2017   22:23:53   (   0.10,-135.46) (   0.33,-134.40)  121.12                80
 07/04/2017   10:43:00   (  -0.12,-135.42) (   0.84,-139.67)  484.04                80
 07/05/2017   10:26:56   (  -0.11,-135.41) (  -0.19,-135.14)   31.87                80
 07/07/2017   22:27:27   (   0.13,-135.42) (   0.04,-135.91)   55.80                80
 07/08/2017   22:11:22   (   0.12,-135.41) (   1.02,-131.37)  459.80                80
 07/10/2017   10:30:29   (  -0.14,-135.35) (   0.15,-136.64)  146.61                80
 07/11/2017   10:14:24   (  -0.13,-135.34) (  -0.83,-132.10)  368.39                80
 07/12/2017   22:33:41   (   0.16,-135.34) (  -0.29,-137.42)  236.36                80