Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 3 6.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 03/07/2018   10:32:59   (   0.03,-135.28) (   0.35,-136.64)  155.93                80
 03/08/2018   10:11:35   (   0.03,-135.25) (  -0.65,-132.11)  357.92                80
 03/09/2018   22:33:32   (  -0.04,-135.22) (  -0.54,-137.42)  250.43                80
 03/10/2018   22:17:28   (  -0.04,-135.20) (   0.45,-132.88)  263.18                80
 03/12/2018   10:39:16   (   0.04,-135.16) (   0.72,-138.15)  341.79                80
 03/13/2018   10:17:51   (   0.04,-135.13) (  -0.28,-133.62)  171.39                80
 03/14/2018   22:39:49   (  -0.05,-135.09) (  -0.91,-138.93)  438.08                80
 03/15/2018   22:23:44   (  -0.05,-135.06) (   0.09,-134.40)   74.87                80
 03/18/2018   10:26:48   (   0.05,-134.97) (   0.09,-135.14)   18.42                80
 03/19/2018   10:05:24   (   0.04,-134.94) (  -0.91,-130.60)  493.87                80