Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2013 4 9.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 04/10/2013   10:30:03   (   0.04,-134.70) (   0.51,-136.83)  241.90                80
 04/11/2013   10:13:59   (   0.04,-134.66) (  -0.47,-132.29)  269.88                80
 04/12/2013   22:33:16   (  -0.04,-134.58) (  -0.71,-137.59)  343.36                80
 04/13/2013   22:17:12   (  -0.04,-134.53) (   0.27,-133.06)  168.04                80
 04/15/2013   10:36:21   (   0.05,-134.48) (   0.89,-138.33)  438.81                80
 04/16/2013   10:20:17   (   0.05,-134.43) (  -0.10,-133.80)   72.33                80
 04/18/2013   22:20:48   (  -0.06,-134.29) (  -0.14,-134.55)   31.14                80
 04/19/2013   22:04:45   (  -0.06,-134.23) (   0.90,-130.03)  479.72                80
 04/21/2013   10:23:53   (   0.06,-134.17) (   0.30,-135.29)  128.28                80
 04/22/2013   10:07:49   (   0.06,-134.11) (  -0.69,-130.76)  382.14                80