Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2017 8 18.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 08/18/2017   22:40:11   (  -0.36,-135.02) (  -1.19,-138.86)  437.32                80
 08/19/2017   22:24:07   (  -0.35,-135.04) (  -0.22,-134.33)   80.16                80
 08/22/2017   10:27:13   (   0.35,-135.05) (   0.35,-135.08)    3.04                80
 08/24/2017   22:27:46   (  -0.35,-135.08) (  -0.51,-135.86)   88.92                80
 08/25/2017   22:11:42   (  -0.35,-135.09) (   0.47,-131.32)  428.32                80
 08/27/2017   10:33:31   (   0.35,-135.10) (   0.70,-136.60)  171.55                80
 08/28/2017   10:12:08   (   0.35,-135.10) (  -0.34,-132.08)  344.42                80
 08/29/2017   22:34:05   (  -0.35,-135.09) (  -0.85,-137.38)  260.61                80
 08/30/2017   22:18:01   (  -0.34,-135.10) (   0.13,-132.85)  255.85                80
 09/01/2017   10:39:50   (   0.34,-135.11) (   1.04,-138.12)  343.96                80