Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 6 10.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 06/11/2018   10:30:35   (  -0.02,-134.47) (   0.50,-136.63)  246.61                80
 06/12/2018   10:14:30   (  -0.01,-134.42) (  -0.53,-132.10)  264.52                80
 06/13/2018   22:33:46   (   0.03,-134.38) (  -0.65,-137.40)  345.14                80
 06/14/2018   22:17:41   (   0.02,-134.32) (   0.32,-132.86)  165.65                80
 06/16/2018   10:36:49   (  -0.05,-134.20) (   0.82,-138.14)  448.88                80
 06/17/2018   10:20:44   (  -0.03,-134.14) (  -0.15,-133.60)   61.44                80
 06/19/2018   22:21:15   (   0.04,-134.02) (  -0.05,-134.36)   39.09                80
 06/20/2018   22:05:10   (   0.03,-133.96) (   0.98,-129.83)  471.31                80
 06/22/2018   10:24:17   (  -0.06,-133.83) (   0.22,-135.09)  143.65                80
 06/23/2018   10:08:12   (  -0.05,-133.77) (  -0.75,-130.55)  366.23                80