Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 5 17.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 05/17/2018   22:40:04   (  -0.06,-135.37) (  -0.88,-138.97)  410.61                80
 05/18/2018   22:24:00   (  -0.06,-135.35) (   0.14,-134.44)  103.82                80
 05/21/2018   10:27:03   (   0.06,-135.26) (   0.06,-135.17)   10.64                80
 05/23/2018   22:27:34   (  -0.06,-135.23) (  -0.21,-135.94)   80.99                80
 05/24/2018   22:11:30   (  -0.07,-135.21) (   0.81,-131.41)  433.02                80
 05/26/2018   10:30:37   (   0.05,-135.14) (   0.41,-136.67)  175.19                80
 05/27/2018   10:14:33   (   0.05,-135.11) (  -0.62,-132.14)  338.48                80
 05/28/2018   22:33:49   (  -0.03,-135.09) (  -0.55,-137.45)  268.17                80
 05/29/2018   22:17:45   (  -0.04,-135.06) (   0.47,-132.92)  245.23                80