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) (  -0.17,-134.37)   73.50                80
 09/07/2017   10:27:24   (   0.33,-135.00) (   0.35,-135.11)   11.98                80
 09/09/2017   22:27:57   (  -0.33,-134.93) (  -0.55,-135.88)  108.62                80
 09/10/2017   22:11:54   (  -0.33,-134.91) (   0.49,-131.36)  405.85                80
 09/12/2017   10:33:42   (   0.32,-134.91) (   0.73,-136.62)  195.07                80
 09/13/2017   10:12:19   (   0.33,-134.89) (  -0.31,-132.10)  318.01                80
 09/14/2017   22:34:15   (  -0.31,-134.80) (  -0.92,-137.39)  295.98                80
 09/15/2017   22:18:12   (  -0.31,-134.78) (   0.12,-132.87)  217.59                80
 09/17/2017   10:40:01   (   0.30,-134.78) (   1.04,-138.15)  382.95                80