Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 1 12.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 01/13/2018   10:24:35   (  -0.05,-134.77) (   0.05,-135.24)   52.97                80
 01/14/2018   10:08:30   (  -0.04,-134.73) (  -0.95,-130.70)  459.15                80
 01/15/2018   22:27:44   (   0.04,-134.62) (  -0.29,-135.99)  156.93                80
 01/16/2018   22:11:38   (   0.04,-134.57) (   0.71,-131.45)  354.66                80
 01/18/2018   10:30:46   (  -0.04,-134.53) (   0.45,-136.72)  249.57                80
 01/19/2018   10:14:40   (  -0.04,-134.49) (  -0.55,-132.19)  261.82                80
 01/20/2018   22:36:36   (   0.04,-134.37) (  -0.63,-137.49)  354.84                80
 01/21/2018   22:15:10   (   0.04,-134.32) (   0.37,-132.95)  156.03                80
 01/23/2018   10:36:56   (  -0.04,-134.27) (   0.85,-138.21)  449.62                80
 01/24/2018   10:20:51   (  -0.04,-134.21) (  -0.15,-133.67)   61.07                80