Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 5 19.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 05/21/2018   10:24:22   (   0.06,-135.26) (   0.07,-135.16)   11.13                80
 05/23/2018   22:27:34   (  -0.06,-135.23) (  -0.23,-135.94)   80.95                80
 05/24/2018   22:11:30   (  -0.07,-135.21) (   0.80,-131.41)  433.09                80
 05/26/2018   10:30:38   (   0.05,-135.14) (   0.36,-136.68)  174.93                80
 05/27/2018   10:14:32   (   0.05,-135.11) (  -0.60,-132.14)  338.79                80
 05/28/2018   22:33:49   (  -0.03,-135.09) (  -0.57,-137.44)  268.02                80
 05/29/2018   22:17:44   (  -0.04,-135.06) (   0.45,-132.91)  245.39                80
 05/31/2018   10:36:52   (   0.02,-134.99) (   0.76,-138.17)  363.61                80
 06/01/2018   10:20:47   (   0.03,-134.96) (  -0.26,-133.64)  149.42                80