Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 6 30.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 06/30/2018   22:17:43   (   0.09,-135.19) (   0.62,-132.90)  261.81                80
 07/02/2018   10:36:51   (  -0.12,-135.22) (   0.56,-138.17)  336.61                80
 07/03/2018   10:20:46   (  -0.11,-135.24) (  -0.47,-133.64)  183.06                80
 07/04/2018   22:40:02   (   0.13,-135.30) (  -0.71,-138.94)  415.81                80
 07/05/2018   22:23:58   (   0.12,-135.32) (   0.33,-134.41)  103.60                80
 07/07/2018   10:43:05   (  -0.15,-135.33) (   0.84,-139.68)  495.71                80
 07/08/2018   10:27:01   (  -0.14,-135.35) (  -0.19,-135.15)   23.09                80
 07/10/2018   22:27:33   (   0.15,-135.40) (   0.05,-135.93)   59.22                80
 07/11/2018   22:11:27   (   0.14,-135.41) (   1.03,-131.39)  458.85                80
 07/13/2018   10:30:36   (  -0.17,-135.41) (   0.08,-136.67)  142.39                80
 07/14/2018   10:14:30   (  -0.16,-135.42) (  -0.90,-132.12)  375.27                80