Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 5 13.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 05/13/2018   22:17:45   (  -0.08,-135.44) (   0.50,-132.94)  285.55                80
 05/15/2018   10:36:52   (   0.07,-135.38) (   0.72,-138.19)  320.97                80
 05/16/2018   10:20:48   (   0.07,-135.37) (  -0.30,-133.66)  193.76                80
 05/17/2018   22:40:04   (  -0.06,-135.37) (  -0.88,-138.97)  410.99                80
 05/18/2018   22:24:00   (  -0.06,-135.34) (   0.14,-134.44)  103.30                80
 05/21/2018   10:24:22   (   0.06,-135.25) (   0.06,-135.17)    9.70                80
 05/23/2018   22:27:34   (  -0.06,-135.22) (  -0.22,-135.94)   82.28                80
 05/24/2018   22:11:30   (  -0.06,-135.19) (   0.80,-131.41)  431.58                80
 05/26/2018   10:30:37   (   0.05,-135.12) (   0.42,-136.67)  177.06                80
 05/27/2018   10:14:33   (   0.05,-135.09) (  -0.60,-132.14)  336.47                80