Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 2 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)
 02/14/2018   10:24:14   (  -0.00,-135.41) (  -0.08,-135.18)   26.56                80
 02/16/2018   22:30:04   (   0.00,-135.41) (  -0.09,-135.95)   60.44                80
 02/17/2018   22:08:39   (   0.01,-135.42) (   0.92,-131.41)  456.77                80
 02/19/2018   10:33:05   (  -0.01,-135.44) (   0.27,-136.68)  141.33                80
 02/20/2018   10:11:40   (  -0.01,-135.44) (  -0.74,-132.14)  375.44                80
 02/21/2018   22:36:15   (   0.01,-135.42) (  -0.44,-137.44)  230.15                80
 02/22/2018   22:14:49   (   0.01,-135.42) (   0.57,-132.91)  286.14                80
 02/24/2018   10:39:16   (   0.00,-135.42) (   0.62,-138.17)  313.44                80
 02/25/2018   10:17:50   (   0.00,-135.41) (  -0.40,-133.64)  202.36                80
 02/26/2018   22:42:26   (  -0.00,-135.38) (  -0.78,-138.94)  404.75                80