Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 5 7.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 05/08/2018   22:11:29   (  -0.09,-135.48) (   0.82,-131.42)  462.83                80
 05/10/2018   10:30:38   (   0.08,-135.44) (   0.34,-136.70)  142.55                80
 05/11/2018   10:14:32   (   0.09,-135.43) (  -0.62,-132.15)  372.98                80
 05/12/2018   22:33:50   (  -0.08,-135.44) (  -0.51,-137.47)  230.50                80
 05/13/2018   22:17:44   (  -0.08,-135.43) (   0.45,-132.93)  284.61                80
 05/15/2018   10:36:52   (   0.07,-135.37) (   0.71,-138.20)  322.17                80
 05/16/2018   10:20:48   (   0.07,-135.35) (  -0.31,-133.67)  192.27                80
 05/17/2018   22:40:04   (  -0.06,-135.35) (  -0.87,-138.97)  413.06                80
 05/18/2018   22:24:00   (  -0.06,-135.32) (   0.15,-134.44)  101.00                80
 05/21/2018   10:27:03   (   0.06,-135.23) (   0.05,-135.17)    6.61                80