Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2017 9 4.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/04/2017   22:24:20   (  -0.34,-135.01) (  -0.18,-134.37)   73.67                80
 09/07/2017   10:27:24   (   0.33,-135.00) (   0.36,-135.11)   11.93                80
 09/09/2017   22:27:57   (  -0.33,-134.93) (  -0.56,-135.88)  108.26                80
 09/10/2017   22:11:54   (  -0.33,-134.92) (   0.48,-131.36)  406.26                80
 09/12/2017   10:33:43   (   0.32,-134.92) (   0.68,-136.63)  194.82                80
 09/13/2017   10:12:19   (   0.33,-134.89) (  -0.30,-132.10)  318.29                80
 09/14/2017   22:34:16   (  -0.31,-134.81) (  -0.87,-137.40)  295.42                80
 09/15/2017   22:18:11   (  -0.31,-134.78) (   0.11,-132.87)  218.17                80
 09/17/2017   10:40:01   (   0.30,-134.79) (   1.05,-138.14)  382.50                80
 09/18/2017   10:18:36   (   0.31,-134.75) (   0.07,-133.61)  130.22                80