Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2013 9 19.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/19/2013   22:34:41   (  -0.34,-135.45) (  -0.79,-137.49)  232.39                80
 09/20/2013   22:18:36   (  -0.35,-135.45) (   0.18,-132.95)  283.74                80
 09/22/2013   10:37:46   (   0.33,-135.49) (   0.97,-138.23)  312.70                80
 09/23/2013   10:21:42   (   0.34,-135.48) (  -0.05,-133.70)  202.77                80
 09/24/2013   22:41:01   (  -0.31,-135.41) (  -1.11,-139.01)  410.33                80
 09/25/2013   22:24:56   (  -0.32,-135.40) (  -0.14,-134.47)  105.08                80
 09/27/2013   10:44:05   (   0.29,-135.43) (   1.29,-139.74)  491.91                80
 09/28/2013   10:28:02   (   0.31,-135.42) (   0.26,-135.22)   22.88                80
 09/30/2013   22:28:36   (  -0.29,-135.31) (  -0.45,-135.99)   76.92                80
 10/01/2013   22:12:32   (  -0.30,-135.30) (   0.59,-131.46)  437.83                80
 10/03/2013   10:31:41   (   0.27,-135.33) (   0.61,-136.72)  160.01                80