Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2013 3 21.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 03/22/2013   22:29:26   (  -0.01,-135.26) (  -0.18,-136.10)   94.39                80
 03/23/2013   22:08:02   (  -0.01,-135.24) (   0.79,-131.56)  419.61                80
 03/25/2013   10:29:51   (   0.02,-135.24) (   0.40,-136.83)  181.56                80
 03/26/2013   10:13:48   (   0.01,-135.22) (  -0.62,-132.30)  332.12                80
 03/27/2013   22:35:45   (  -0.01,-135.15) (  -0.58,-137.60)  279.79                80
 03/28/2013   22:14:22   (  -0.01,-135.12) (   0.45,-133.08)  233.26                80
 03/30/2013   10:36:11   (   0.01,-135.10) (   0.73,-138.35)  369.59                80
 03/31/2013   10:20:08   (   0.01,-135.07) (  -0.29,-133.82)  143.01                80
 04/01/2013   22:42:04   (  -0.01,-134.99) (  -0.96,-139.11)  470.35                80
 04/02/2013   22:20:40   (  -0.01,-134.95) (   0.07,-134.59)   41.78                80