Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2017 8 31.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/01/2017   10:39:50   (   0.34,-135.07) (   1.04,-138.12)  347.85                80
 09/02/2017   10:18:26   (   0.34,-135.05) (  -0.00,-133.59)  166.86                80
 09/03/2017   22:40:24   (  -0.34,-135.01) (  -1.18,-138.90)  442.33                80
 09/04/2017   22:24:19   (  -0.34,-135.01) (  -0.20,-134.36)   72.98                80
 09/07/2017   10:27:25   (   0.33,-135.00) (   0.33,-135.12)   12.67                80
 09/09/2017   22:27:58   (  -0.33,-134.92) (  -0.53,-135.89)  109.42                80
 09/10/2017   22:11:53   (  -0.33,-134.91) (   0.46,-131.35)  405.00                80
 09/12/2017   10:33:43   (   0.32,-134.91) (   0.71,-136.63)  195.69                80
 09/13/2017   10:12:18   (   0.32,-134.88) (  -0.27,-132.09)  317.34                80