Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2016 12 20.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 12/20/2016   10:21:30   (  -0.05,-135.13) (  -0.36,-133.81)  151.52                80
 12/21/2016   22:40:45   (   0.06,-135.07) (  -0.85,-139.11)  460.36                80
 12/22/2016   22:24:40   (   0.05,-135.04) (   0.14,-134.57)   53.43                80
 12/25/2016   10:25:03   (  -0.05,-134.99) (   0.02,-135.31)   36.24                80
 12/26/2016   10:08:57   (  -0.04,-134.96) (  -0.96,-130.77)  476.86                80
 12/27/2016   22:28:13   (   0.06,-134.88) (  -0.24,-136.07)  136.35                80
 12/28/2016   22:12:08   (   0.05,-134.84) (   0.80,-131.54)  376.47                80
 12/30/2016   10:31:15   (  -0.06,-134.81) (   0.39,-136.81)  227.85                80
 12/31/2016   10:15:10   (  -0.05,-134.77) (  -0.59,-132.27)  284.39                80
 01/01/2017   22:34:25   (   0.06,-134.68) (  -0.60,-137.57)  330.20                80
 01/02/2017   22:18:21   (   0.06,-134.64) (   0.44,-133.05)  181.78                80