Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2017 7 9.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 07/10/2017   10:30:29   (  -0.14,-135.33) (   0.16,-136.63)  148.64                80
 07/11/2017   10:14:25   (  -0.13,-135.31) (  -0.88,-132.11)  366.08                80
 07/12/2017   22:33:41   (   0.16,-135.32) (  -0.31,-137.41)  238.55                80
 07/13/2017   22:17:35   (   0.15,-135.30) (   0.67,-132.87)  276.16                80
 07/15/2017   10:36:43   (  -0.17,-135.23) (   0.50,-138.14)  331.59                80
 07/16/2017   10:20:38   (  -0.16,-135.20) (  -0.54,-133.61)  182.39                80
 07/17/2017   22:39:54   (   0.18,-135.19) (  -0.64,-138.91)  424.20                80
 07/18/2017   22:23:49   (   0.18,-135.16) (   0.34,-134.37)   89.51                80
 07/21/2017   10:26:52   (  -0.19,-135.05) (  -0.21,-135.11)    7.05                80