Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 4 22.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 04/24/2018   10:30:34   (   0.10,-135.43) (   0.40,-136.68)  143.63                80
 04/25/2018   10:14:30   (   0.10,-135.44) (  -0.61,-132.15)  374.29                80
 04/26/2018   22:33:47   (  -0.10,-135.47) (  -0.53,-137.47)  227.54                80
 04/27/2018   22:17:43   (  -0.10,-135.48) (   0.48,-132.94)  290.14                80
 04/29/2018   10:36:51   (   0.09,-135.49) (   0.69,-138.21)  309.79                80
 04/30/2018   10:20:47   (   0.10,-135.49) (  -0.33,-133.68)  207.63                80
 05/01/2018   22:40:03   (  -0.09,-135.51) (  -0.86,-138.98)  394.99                80
 05/02/2018   22:23:58   (  -0.09,-135.52) (   0.15,-134.45)  122.03                80
 05/04/2018   10:43:07   (   0.08,-135.51) (   1.01,-139.72)  479.16                80
 05/05/2018   10:27:02   (   0.09,-135.52) (  -0.00,-135.19)   37.62                80