Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2017 8 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)
 08/22/2017   10:27:12   (   0.35,-135.05) (   0.35,-135.08)    3.18                80
 08/24/2017   22:27:46   (  -0.35,-135.07) (  -0.51,-135.86)   89.35                80
 08/25/2017   22:11:42   (  -0.35,-135.08) (   0.47,-131.32)  427.82                80
 08/27/2017   10:33:31   (   0.35,-135.09) (   0.70,-136.60)  172.12                80
 08/28/2017   10:12:08   (   0.35,-135.09) (  -0.33,-132.07)  343.79                80
 08/29/2017   22:34:05   (  -0.35,-135.08) (  -0.85,-137.38)  261.39                80
 08/30/2017   22:18:01   (  -0.34,-135.09) (   0.13,-132.84)  255.01                80
 09/01/2017   10:39:50   (   0.34,-135.10) (   1.04,-138.12)  344.89                80
 09/02/2017   10:18:26   (   0.34,-135.09) (   0.01,-133.60)  170.29                80