Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 2 21.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 02/21/2018   22:36:15   (  -0.00,-135.42) (  -0.43,-137.44)  229.70                80
 02/22/2018   22:14:50   (   0.00,-135.42) (   0.58,-132.91)  286.80                80
 02/24/2018   10:39:16   (   0.00,-135.43) (   0.60,-138.17)  312.00                80
 02/25/2018   10:17:50   (   0.00,-135.42) (  -0.42,-133.64)  203.96                80
 02/26/2018   22:42:25   (  -0.01,-135.39) (  -0.82,-138.93)  403.26                80
 02/27/2018   22:20:59   (  -0.01,-135.38) (   0.19,-134.39)  112.42                80
 03/01/2018   10:45:26   (   0.01,-135.38) (   0.98,-139.65)  487.30                80
 03/02/2018   10:24:00   (   0.00,-135.37) (  -0.03,-135.12)   28.27                80
 03/04/2018   22:29:50   (  -0.00,-135.32) (  -0.13,-135.89)   64.17                80
 03/05/2018   22:08:25   (   0.00,-135.31) (   0.89,-131.35)  451.06                80
 03/07/2018   10:32:51   (   0.00,-135.30) (   0.29,-136.62)  149.36                80