Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2015 5 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)
 05/19/2015   10:19:25   (   0.04,-135.38) (  -0.70,-132.14)  369.36                80
 05/20/2015   22:38:42   (  -0.03,-135.33) (  -0.49,-137.45)  241.00                80
 05/21/2015   22:22:36   (  -0.04,-135.32) (   0.49,-132.91)  273.67                80
 05/23/2015   10:41:44   (   0.03,-135.32) (   0.64,-138.20)  327.54                80
 05/24/2015   10:25:39   (   0.03,-135.30) (  -0.33,-133.66)  187.05                80
 05/25/2015   22:44:55   (  -0.02,-135.25) (  -0.85,-138.97)  423.79                80
 05/26/2015   22:28:50   (  -0.03,-135.23) (   0.13,-134.43)   90.47                80
 05/29/2015   10:31:53   (   0.02,-135.20) (   0.01,-135.18)    2.39                80
 05/31/2015   22:32:24   (  -0.01,-135.11) (  -0.21,-135.96)   96.17                80
 06/01/2015   22:16:18   (  -0.02,-135.09) (   0.78,-131.42)  417.04                80