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

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 03/18/2018   10:26:47   (   0.05,-134.95) (   0.11,-135.13)   21.38                80
 03/19/2018   10:05:24   (   0.05,-134.91) (  -0.94,-130.61)  490.85                80
 03/20/2018   22:27:20   (  -0.05,-134.86) (  -0.30,-135.90)  119.38                80
 03/21/2018   22:11:16   (  -0.05,-134.82) (   0.70,-131.37)  392.32                80
 03/23/2018   10:33:04   (   0.06,-134.74) (   0.47,-136.64)  216.62                80
 03/24/2018   10:11:40   (   0.06,-134.69) (  -0.53,-132.11)  294.50                80
 03/25/2018   22:33:36   (  -0.07,-134.63) (  -0.71,-137.41)  317.32                80
 03/26/2018   22:17:31   (  -0.07,-134.58) (   0.29,-132.87)  193.55                80
 03/28/2018   10:39:20   (   0.07,-134.49) (   0.88,-138.15)  416.32                80
 03/29/2018   10:17:55   (   0.07,-134.44) (  -0.12,-133.61)   94.31                80