Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2017 7 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)
 07/13/2017   22:17:36   (   0.15,-135.30) (   0.69,-132.87)  277.03                80
 07/15/2017   10:36:43   (  -0.17,-135.23) (   0.48,-138.14)  331.28                80
 07/16/2017   10:20:37   (  -0.16,-135.21) (  -0.50,-133.60)  182.81                80
 07/17/2017   22:39:55   (   0.18,-135.20) (  -0.62,-138.92)  422.81                80
 07/18/2017   22:23:49   (   0.17,-135.17) (   0.36,-134.37)   91.04                80
 07/21/2017   10:24:11   (  -0.19,-135.06) (  -0.17,-135.10)    5.23                80
 07/23/2017   22:27:22   (   0.21,-135.00) (  -0.02,-135.87)   99.68                80
 07/24/2017   22:11:17   (   0.20,-134.96) (   1.02,-131.34)  413.49                80
 07/26/2017   10:30:25   (  -0.22,-134.88) (   0.15,-136.61)  196.25                80
 07/27/2017   10:14:19   (  -0.21,-134.84) (  -0.84,-132.07)  316.42                80