Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2017 8 13.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 08/13/2017   22:33:51   (  -0.36,-134.95) (  -0.90,-137.33)  271.22                80
 08/14/2017   22:17:48   (  -0.35,-134.97) (   0.13,-132.81)  246.94                80
 08/16/2017   10:39:37   (   0.36,-134.99) (   1.03,-138.08)  352.58                80
 08/17/2017   10:18:14   (   0.35,-134.99) (   0.00,-133.56)  164.12                80
 08/18/2017   22:40:11   (  -0.36,-135.02) (  -1.20,-138.86)  438.01                80
 08/19/2017   22:24:07   (  -0.35,-135.03) (  -0.22,-134.33)   79.43                80
 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)   90.01                80
 08/25/2017   22:11:42   (  -0.35,-135.08) (   0.47,-131.33)  427.19                80
 08/27/2017   10:33:31   (   0.35,-135.09) (   0.70,-136.60)  172.05                80