Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 6 8.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 06/08/2018   22:27:33   (  -0.00,-134.63) (  -0.27,-135.91)  145.06                80
 06/09/2018   22:11:27   (  -0.01,-134.59) (   0.70,-131.37)  366.68                80
 06/11/2018   10:30:35   (  -0.01,-134.47) (   0.44,-136.64)  246.83                80
 06/12/2018   10:14:30   (  -0.01,-134.42) (  -0.53,-132.10)  264.17                80
 06/13/2018   22:33:46   (   0.03,-134.37) (  -0.65,-137.40)  345.74                80
 06/14/2018   22:17:41   (   0.02,-134.31) (   0.32,-132.86)  164.94                80
 06/16/2018   10:36:49   (  -0.05,-134.19) (   0.82,-138.14)  449.68                80
 06/17/2018   10:20:44   (  -0.03,-134.13) (  -0.15,-133.60)   60.52                80
 06/19/2018   22:21:14   (   0.04,-134.01) (  -0.05,-134.36)   40.35                80
 06/20/2018   22:05:10   (   0.03,-133.95) (   0.98,-129.83)  469.92                80
 06/22/2018   10:24:17   (  -0.06,-133.82) (   0.21,-135.09)  145.12                80