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) (  -0.80,-137.49)  232.61                80
 09/20/2013   22:18:37   (  -0.35,-135.44) (   0.22,-132.96)  283.48                80
 09/22/2013   10:37:47   (   0.33,-135.49) (   0.93,-138.24)  313.00                80
 09/23/2013   10:21:42   (   0.34,-135.48) (  -0.04,-133.70)  202.44                80
 09/24/2013   22:41:00   (  -0.31,-135.40) (  -1.13,-139.01)  410.68                80
 09/25/2013   22:24:57   (  -0.32,-135.39) (  -0.10,-134.48)  104.69                80
 09/27/2013   10:44:06   (   0.29,-135.43) (   1.24,-139.75)  492.36                80
 09/28/2013   10:28:02   (   0.31,-135.41) (   0.27,-135.21)   22.42                80
 09/30/2013   22:28:36   (  -0.29,-135.31) (  -0.46,-135.99)   77.47                80
 10/01/2013   22:12:32   (  -0.30,-135.29) (   0.57,-131.46)  437.27                80