Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2017 7 12.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 07/12/2017   22:33:41   (   0.16,-135.32) (  -0.28,-137.41)  237.88                80
 07/13/2017   22:17:36   (   0.15,-135.30) (   0.70,-132.87)  276.95                80
 07/15/2017   10:36:43   (  -0.17,-135.23) (   0.47,-138.14)  331.30                80
 07/16/2017   10:20:38   (  -0.16,-135.21) (  -0.51,-133.60)  182.76                80
 07/17/2017   22:39:54   (   0.18,-135.20) (  -0.67,-138.90)  422.98                80
 07/18/2017   22:23:49   (   0.17,-135.17) (   0.37,-134.38)   90.86                80
 07/21/2017   10:24:11   (  -0.19,-135.06) (  -0.18,-135.10)    5.33                80
 07/23/2017   22:27:22   (   0.21,-135.00) (  -0.01,-135.87)   99.95                80
 07/24/2017   22:11:18   (   0.20,-134.96) (   1.04,-131.34)  413.17                80
 07/26/2017   10:30:24   (  -0.22,-134.88) (   0.19,-136.60)  196.53                80