Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 5 11.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 05/12/2018   22:33:50   (  -0.08,-135.45) (  -0.50,-137.47)  229.83                80
 05/13/2018   22:17:44   (  -0.08,-135.43) (   0.45,-132.92)  285.42                80
 05/15/2018   10:36:52   (   0.07,-135.38) (   0.71,-138.20)  321.31                80
 05/16/2018   10:20:48   (   0.07,-135.36) (  -0.31,-133.67)  193.29                80
 05/17/2018   22:40:04   (  -0.06,-135.36) (  -0.87,-138.97)  411.59                80
 05/18/2018   22:24:00   (  -0.06,-135.34) (   0.15,-134.44)  102.58                80
 05/21/2018   10:27:03   (   0.06,-135.25) (   0.06,-135.17)    8.49                80
 05/23/2018   22:27:34   (  -0.06,-135.21) (  -0.21,-135.94)   83.61                80
 05/24/2018   22:11:30   (  -0.06,-135.18) (   0.81,-131.41)  430.15                80