Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2017 9 6.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/07/2017   10:27:24   (   0.33,-135.00) (   0.38,-135.10)   12.18                80
 09/09/2017   22:27:58   (  -0.33,-134.94) (  -0.52,-135.89)  107.54                80
 09/10/2017   22:11:53   (  -0.33,-134.92) (   0.46,-131.35)  407.10                80
 09/12/2017   10:33:43   (   0.32,-134.92) (   0.70,-136.63)  194.25                80
 09/13/2017   10:12:18   (   0.33,-134.89) (  -0.28,-132.09)  318.94                80
 09/14/2017   22:34:15   (  -0.31,-134.82) (  -0.89,-137.40)  294.21                80
 09/15/2017   22:18:11   (  -0.31,-134.79) (   0.09,-132.86)  219.50                80
 09/17/2017   10:40:00   (   0.30,-134.80) (   1.07,-138.14)  381.46                80
 09/18/2017   10:18:37   (   0.31,-134.76) (   0.02,-133.62)  131.37                80
 09/19/2017   22:40:33   (  -0.29,-134.67) (  -1.26,-138.91)  483.81                80