Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2015 8 18.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 08/19/2015   22:31:29   (   0.29,-134.68) (  -0.00,-136.02)  152.35                80
 08/20/2015   22:15:24   (   0.29,-134.65) (   1.02,-131.49)  360.68                80
 08/22/2015   10:34:30   (  -0.30,-134.55) (   0.16,-136.76)  250.43                80
 08/23/2015   10:18:24   (  -0.30,-134.52) (  -0.80,-132.21)  262.13                80
 08/24/2015   22:37:38   (   0.31,-134.50) (  -0.39,-137.51)  344.59                80
 08/25/2015   22:21:33   (   0.31,-134.45) (   0.64,-132.98)  167.44                80
 08/27/2015   10:40:39   (  -0.32,-134.34) (   0.54,-138.25)  445.05                80
 08/28/2015   10:24:32   (  -0.32,-134.30) (  -0.42,-133.71)   66.67                80
 08/30/2015   22:25:01   (   0.32,-134.22) (   0.26,-134.48)   29.71                80
 08/31/2015   22:08:56   (   0.32,-134.17) (   1.29,-129.95)  481.54                80