Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2016 4 20.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 04/20/2016   22:34:55   (  -0.06,-135.39) (  -0.49,-137.45)  233.44                80
 04/21/2016   22:18:51   (  -0.06,-135.39) (   0.52,-132.92)  282.71                80
 04/23/2016   10:40:39   (   0.06,-135.39) (   0.66,-138.19)  318.12                80
 04/24/2016   10:19:14   (   0.06,-135.39) (  -0.35,-133.66)  197.32                80
 04/25/2016   22:41:11   (  -0.06,-135.36) (  -0.84,-138.96)  409.99                80
 04/26/2016   22:25:06   (  -0.06,-135.35) (   0.17,-134.44)  105.30                80
 04/28/2016   10:46:55   (   0.06,-135.35) (   1.01,-139.71)  496.46                80
 04/29/2016   10:25:29   (   0.06,-135.33) (   0.06,-135.17)   18.39                80
 05/01/2016   22:28:41   (  -0.07,-135.27) (  -0.23,-135.94)   76.44                80
 05/02/2016   22:12:37   (  -0.07,-135.26) (   0.79,-131.41)  437.92                80