Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2013 9 10.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/11/2013   10:43:50   (   0.38,-135.50) (   1.34,-139.72)  481.64                80
 09/12/2013   10:27:46   (   0.39,-135.50) (   0.31,-135.20)   34.56                80
 09/14/2013   22:28:20   (  -0.37,-135.44) (  -0.52,-135.97)   61.08                80
 09/15/2013   22:12:17   (  -0.38,-135.43) (   0.51,-131.44)  455.17                80
 09/17/2013   10:31:26   (   0.36,-135.48) (   0.64,-136.71)  140.29                80
 09/18/2013   10:15:23   (   0.36,-135.48) (  -0.38,-132.19)  375.50                80
 09/19/2013   22:34:40   (  -0.34,-135.41) (  -0.84,-137.48)  237.34                80
 09/20/2013   22:18:36   (  -0.35,-135.40) (   0.19,-132.96)  278.63                80
 09/22/2013   10:37:46   (   0.33,-135.45) (   0.96,-138.23)  316.85                80
 09/23/2013   10:21:42   (   0.34,-135.44) (  -0.07,-133.71)  198.46                80