Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2015 4 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)
 04/13/2015   22:32:56   (  -0.05,-135.02) (  -0.23,-135.91)  101.61                80
 04/14/2015   22:16:49   (  -0.05,-135.04) (   0.77,-131.37)  418.37                80
 04/16/2015   10:38:35   (   0.05,-135.13) (   0.41,-136.64)  172.66                80
 04/17/2015   10:17:09   (   0.05,-135.15) (  -0.65,-132.11)  346.78                80
 04/18/2015   22:39:02   (  -0.05,-135.15) (  -0.55,-137.41)  257.85                80
 04/19/2015   22:22:56   (  -0.05,-135.17) (   0.45,-132.87)  261.45                80
 04/21/2015   10:44:41   (   0.05,-135.25) (   0.72,-138.14)  330.27                80
 04/22/2015   10:23:16   (   0.05,-135.27) (  -0.34,-133.62)  188.62                80
 04/23/2015   22:45:09   (  -0.05,-135.25) (  -0.85,-138.91)  417.09                80
 04/24/2015   22:29:03   (  -0.05,-135.27) (   0.16,-134.38)  101.77                80
 04/26/2015   10:50:48   (   0.06,-135.34) (   1.01,-139.64)  490.39                80