Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2017 6 24.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 06/25/2017   10:14:26   (  -0.06,-135.43) (  -0.78,-132.11)  377.73                80
 06/26/2017   22:33:44   (   0.08,-135.48) (  -0.35,-137.43)  222.27                80
 06/27/2017   22:17:38   (   0.07,-135.48) (   0.62,-132.89)  294.92                80
 06/29/2017   10:36:46   (  -0.09,-135.44) (   0.49,-138.17)  309.74                80
 06/30/2017   10:20:41   (  -0.08,-135.44) (  -0.48,-133.63)  207.14                80
 07/01/2017   22:39:58   (   0.11,-135.48) (  -0.65,-138.94)  393.69                80
 07/02/2017   22:23:53   (   0.10,-135.48) (   0.33,-134.40)  123.08                80
 07/04/2017   10:43:00   (  -0.12,-135.44) (   0.85,-139.67)  482.08                80
 07/05/2017   10:26:56   (  -0.11,-135.44) (  -0.19,-135.14)   34.08                80
 07/07/2017   22:27:27   (   0.13,-135.45) (   0.04,-135.91)   52.28                80