Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 6 5.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 06/06/2018   10:24:21   (   0.01,-134.71) (   0.13,-135.13)   49.21                80
 06/07/2018   10:08:16   (   0.02,-134.66) (  -0.89,-130.60)  462.71                80
 06/08/2018   22:27:32   (  -0.00,-134.63) (  -0.28,-135.91)  145.51                80
 06/09/2018   22:11:27   (  -0.01,-134.58) (   0.68,-131.36)  366.09                80
 06/11/2018   10:30:35   (  -0.01,-134.47) (   0.46,-136.64)  247.40                80
 06/12/2018   10:14:30   (  -0.01,-134.41) (  -0.51,-132.10)  263.43                80
 06/13/2018   22:33:46   (   0.03,-134.36) (  -0.66,-137.40)  346.99                80
 06/14/2018   22:17:42   (   0.02,-134.30) (   0.36,-132.87)  163.55                80
 06/16/2018   10:36:49   (  -0.05,-134.18) (   0.83,-138.14)  451.01                80
 06/17/2018   10:20:43   (  -0.03,-134.11) (  -0.14,-133.59)   59.04                80