Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2016 9 17.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/17/2016   22:24:23   (  -0.32,-135.46) (  -0.05,-134.32)  130.58                80
 09/19/2016   10:43:32   (   0.31,-135.48) (   1.24,-139.59)  468.42                80
 09/20/2016   10:24:48   (   0.32,-135.48) (   0.22,-135.07)   47.06                80
 09/22/2016   22:28:02   (  -0.31,-135.43) (  -0.41,-135.85)   47.34                80
 09/23/2016   22:11:59   (  -0.31,-135.43) (   0.61,-131.32)  467.97                80
 09/25/2016   10:31:08   (   0.29,-135.44) (   0.57,-136.60)  132.19                80
 09/26/2016   10:12:25   (   0.30,-135.43) (  -0.45,-132.07)  382.58                80
 09/27/2016   22:34:23   (  -0.28,-135.38) (  -0.70,-137.39)  228.62                80
 09/28/2016   22:18:18   (  -0.28,-135.37) (   0.26,-132.85)  286.46                80
 09/30/2016   10:37:29   (   0.26,-135.39) (   0.85,-138.14)  313.35                80