Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2015 9 19.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/20/2015   22:30:44   (  -0.32,-135.28) (  -0.42,-135.86)   65.06                80
 09/21/2015   22:14:38   (  -0.32,-135.28) (   0.56,-131.32)  451.44                80
 09/23/2015   10:33:44   (   0.30,-135.24) (   0.58,-136.59)  152.92                80
 09/24/2015   10:17:37   (   0.31,-135.23) (  -0.40,-132.05)  362.82                80
 09/25/2015   22:36:52   (  -0.28,-135.23) (  -0.79,-137.35)  241.55                80
 09/26/2015   22:20:46   (  -0.29,-135.22) (   0.26,-132.82)  274.31                80
 09/28/2015   10:39:52   (   0.27,-135.19) (   0.93,-138.08)  330.25                80
 09/29/2015   10:23:45   (   0.28,-135.17) (  -0.05,-133.54)  184.94                80
 09/30/2015   22:43:00   (  -0.26,-135.16) (  -1.08,-138.85)  421.26                80
 10/01/2015   22:26:54   (  -0.27,-135.14) (  -0.09,-134.31)   93.89                80