Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 5 31.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 06/01/2018   10:20:47   (   0.03,-134.92) (  -0.27,-133.64)  145.77                80
 06/02/2018   22:40:04   (  -0.01,-134.89) (  -0.90,-138.95)  461.93                80
 06/03/2018   22:23:58   (  -0.02,-134.85) (   0.06,-134.40)   50.48                80
 06/06/2018   10:24:21   (   0.01,-134.71) (   0.12,-135.14)   49.02                80
 06/07/2018   10:08:16   (   0.03,-134.66) (  -0.91,-130.61)  462.79                80
 06/08/2018   22:27:33   (  -0.00,-134.62) (  -0.27,-135.91)  146.31                80
 06/09/2018   22:11:27   (  -0.01,-134.58) (   0.70,-131.37)  365.25                80
 06/11/2018   10:30:36   (  -0.01,-134.47) (   0.45,-136.64)  247.55                80
 06/12/2018   10:14:30   (  -0.00,-134.41) (  -0.52,-132.10)  263.23                80
 06/13/2018   22:33:46   (   0.03,-134.35) (  -0.66,-137.41)  348.04                80