Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 1 11.  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) (   0.04,-135.24)   52.87                80
 01/14/2018   10:08:30   (  -0.04,-134.73) (  -0.96,-130.70)  459.30                80
 01/15/2018   22:27:44   (   0.04,-134.62) (  -0.28,-135.99)  156.81                80
 01/16/2018   22:11:39   (   0.04,-134.57) (   0.72,-131.45)  354.80                80
 01/18/2018   10:30:46   (  -0.04,-134.54) (   0.45,-136.72)  249.27                80
 01/19/2018   10:14:40   (  -0.04,-134.49) (  -0.55,-132.19)  262.16                80
 01/20/2018   22:36:35   (   0.04,-134.37) (  -0.68,-137.48)  354.56                80
 01/21/2018   22:15:09   (   0.04,-134.32) (   0.32,-132.94)  156.37                80
 01/23/2018   10:36:56   (  -0.04,-134.27) (   0.84,-138.21)  449.13                80
 01/24/2018   10:20:51   (  -0.04,-134.22) (  -0.16,-133.68)   61.59                80