Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2017 8 25.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 08/27/2017   10:33:31   (   0.35,-135.08) (   0.72,-136.59)  173.12                80
 08/28/2017   10:12:07   (   0.35,-135.07) (  -0.32,-132.07)  342.49                80
 08/29/2017   22:34:05   (  -0.35,-135.06) (  -0.87,-137.37)  263.66                80
 08/30/2017   22:18:01   (  -0.35,-135.06) (   0.17,-132.85)  252.41                80
 09/01/2017   10:39:51   (   0.34,-135.07) (   1.00,-138.13)  347.42                80
 09/02/2017   10:18:26   (   0.34,-135.06) (   0.02,-133.59)  167.45                80
 09/03/2017   22:40:23   (  -0.33,-135.02) (  -1.20,-138.90)  441.37                80
 09/04/2017   22:24:20   (  -0.33,-135.02) (  -0.16,-134.37)   74.11                80
 09/07/2017   10:27:25   (   0.33,-135.02) (   0.35,-135.11)   11.06                80