Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2016 12 21.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 12/21/2016   22:40:46   (   0.06,-135.07) (  -0.83,-139.11)  460.41                80
 12/22/2016   22:24:40   (   0.05,-135.04) (   0.15,-134.57)   53.21                80
 12/25/2016   10:25:03   (  -0.05,-134.98) (   0.01,-135.31)   37.06                80
 12/26/2016   10:08:57   (  -0.04,-134.95) (  -0.97,-130.77)  475.92                80
 12/27/2016   22:28:13   (   0.06,-134.87) (  -0.23,-136.07)  137.11                80
 12/28/2016   22:12:08   (   0.05,-134.84) (   0.81,-131.55)  375.56                80
 12/30/2016   10:31:16   (  -0.06,-134.80) (   0.38,-136.81)  229.29                80
 12/31/2016   10:15:10   (  -0.05,-134.76) (  -0.60,-132.28)  282.83                80
 01/01/2017   22:34:25   (   0.06,-134.67) (  -0.59,-137.58)  331.59                80
 01/02/2017   22:18:20   (   0.06,-134.62) (   0.39,-133.04)  180.24                80