Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 4 25.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 04/26/2018   22:33:47   (  -0.10,-135.47) (  -0.55,-137.46)  227.69                80
 04/27/2018   22:17:43   (  -0.10,-135.48) (   0.47,-132.93)  289.89                80
 04/29/2018   10:36:51   (   0.09,-135.48) (   0.70,-138.20)  310.48                80
 04/30/2018   10:20:46   (   0.09,-135.49) (  -0.31,-133.67)  206.82                80
 05/01/2018   22:40:03   (  -0.09,-135.51) (  -0.88,-138.97)  395.72                80
 05/02/2018   22:23:58   (  -0.09,-135.51) (   0.13,-134.44)  121.23                80
 05/04/2018   10:43:07   (   0.08,-135.50) (   1.04,-139.72)  480.36                80
 05/05/2018   10:27:02   (   0.09,-135.50) (   0.02,-135.18)   36.26                80
 05/07/2018   22:27:34   (  -0.09,-135.51) (  -0.19,-135.96)   50.95                80
 05/08/2018   22:11:29   (  -0.09,-135.51) (   0.82,-131.43)  465.28                80