Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2015 9 15.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/15/2015   22:27:15   (  -0.34,-135.28) (  -0.10,-134.36)  105.95                80
 09/17/2015   10:46:21   (   0.32,-135.27) (   1.31,-139.62)  496.09                80
 09/18/2015   10:30:15   (   0.33,-135.27) (   0.27,-135.09)   20.87                80
 09/20/2015   22:30:43   (  -0.32,-135.28) (  -0.47,-135.85)   65.69                80
 09/21/2015   22:14:38   (  -0.32,-135.27) (   0.57,-131.32)  450.87                80
 09/23/2015   10:33:44   (   0.30,-135.25) (   0.57,-136.59)  152.72                80
 09/24/2015   10:17:37   (   0.31,-135.24) (  -0.41,-132.05)  363.07                80
 09/25/2015   22:36:52   (  -0.28,-135.23) (  -0.77,-137.35)  241.98                80
 09/26/2015   22:20:45   (  -0.29,-135.22) (   0.21,-132.81)  273.90                80
 09/28/2015   10:39:52   (   0.27,-135.19) (   0.92,-138.09)  329.92                80
 09/29/2015   10:23:45   (   0.28,-135.17) (  -0.07,-133.55)  185.28                80