Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 5 14.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 05/15/2018   10:36:53   (   0.07,-135.38) (   0.67,-138.20)  320.84                80
 05/16/2018   10:20:48   (   0.07,-135.37) (  -0.29,-133.66)  193.97                80
 05/17/2018   22:40:05   (  -0.06,-135.37) (  -0.84,-138.98)  410.75                80
 05/18/2018   22:23:59   (  -0.06,-135.35) (   0.12,-134.43)  103.62                80
 05/21/2018   10:27:03   (   0.06,-135.26) (   0.02,-135.18)   10.24                80
 05/23/2018   22:27:34   (  -0.06,-135.22) (  -0.23,-135.94)   81.67                80
 05/24/2018   22:11:30   (  -0.07,-135.20) (   0.79,-131.41)  432.27                80
 05/26/2018   10:30:38   (   0.05,-135.13) (   0.37,-136.68)  176.22                80
 05/27/2018   10:14:32   (   0.05,-135.10) (  -0.59,-132.14)  337.37                80