Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 8 8.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 08/09/2018   10:27:17   (  -0.31,-135.29) (  -0.32,-135.20)    9.97                80
 08/11/2018   22:27:51   (   0.32,-135.26) (   0.16,-135.98)   81.96                80
 08/12/2018   22:11:47   (   0.31,-135.24) (   1.14,-131.44)  431.76                80
 08/14/2018   10:30:56   (  -0.33,-135.16) (  -0.00,-136.72)  177.66                80
 08/15/2018   10:14:51   (  -0.32,-135.13) (  -0.98,-132.19)  335.70                80
 08/16/2018   22:34:09   (   0.34,-135.12) (  -0.21,-137.49)  270.64                80
 08/17/2018   22:18:05   (   0.34,-135.09) (   0.83,-132.97)  242.63                80
 08/19/2018   10:37:14   (  -0.36,-135.01) (   0.37,-138.23)  367.24                80
 08/20/2018   10:21:09   (  -0.35,-134.98) (  -0.61,-133.70)  145.39                80
 08/21/2018   22:40:27   (   0.37,-134.96) (  -0.51,-139.02)  462.44                80