Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2015 5 12.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 05/12/2015   10:48:00   (   0.05,-135.43) (   1.00,-139.67)  482.96                80
 05/13/2015   10:31:56   (   0.06,-135.42) (  -0.02,-135.14)   32.26                80
 05/15/2015   22:32:26   (  -0.05,-135.36) (  -0.20,-135.91)   63.57                80
 05/16/2015   22:16:22   (  -0.05,-135.35) (   0.83,-131.39)  451.19                80
 05/18/2015   10:35:29   (   0.04,-135.36) (   0.36,-136.66)  149.21                80
 05/19/2015   10:19:25   (   0.05,-135.34) (  -0.67,-132.13)  365.26                80
 05/20/2015   22:38:41   (  -0.04,-135.28) (  -0.51,-137.45)  246.51                80
 05/21/2015   22:22:36   (  -0.04,-135.26) (   0.47,-132.91)  267.75                80
 05/23/2015   10:41:43   (   0.03,-135.26) (   0.71,-138.18)  333.30                80
 05/24/2015   10:25:38   (   0.04,-135.24) (  -0.33,-133.66)  180.86                80
 05/25/2015   22:44:54   (  -0.03,-135.18) (  -0.90,-138.96)  431.44                80