Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 7 11.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 07/13/2018   10:30:35   (  -0.17,-135.43) (   0.11,-136.66)  139.71                80
 07/14/2018   10:14:31   (  -0.16,-135.44) (  -0.93,-132.13)  378.42                80
 07/15/2018   22:33:47   (   0.19,-135.49) (  -0.26,-137.43)  221.61                80
 07/16/2018   22:17:42   (   0.17,-135.50) (   0.78,-132.90)  296.47                80
 07/18/2018   10:36:50   (  -0.20,-135.48) (   0.38,-138.17)  305.72                80
 07/19/2018   10:20:44   (  -0.19,-135.49) (  -0.60,-133.63)  212.10                80
 07/20/2018   22:40:01   (   0.22,-135.53) (  -0.52,-138.95)  388.63                80
 07/21/2018   22:23:56   (   0.21,-135.54) (   0.46,-134.41)  128.92                80
 07/23/2018   10:43:03   (  -0.24,-135.52) (   0.71,-139.67)  474.07                80
 07/24/2018   10:26:59   (  -0.23,-135.52) (  -0.33,-135.15)   43.03                80