Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2015 9 20.  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) (  -0.43,-135.86)   65.01                80
 09/21/2015   22:14:38   (  -0.32,-135.28) (   0.56,-131.31)  451.49                80
 09/23/2015   10:33:44   (   0.30,-135.24) (   0.58,-136.59)  152.85                80
 09/24/2015   10:17:37   (   0.31,-135.23) (  -0.41,-132.05)  362.90                80
 09/25/2015   22:36:52   (  -0.28,-135.23) (  -0.78,-137.35)  241.45                80
 09/26/2015   22:20:46   (  -0.29,-135.22) (   0.26,-132.82)  274.43                80
 09/28/2015   10:39:51   (   0.27,-135.19) (   0.93,-138.08)  330.10                80
 09/29/2015   10:23:45   (   0.28,-135.17) (  -0.06,-133.54)  185.09                80
 09/30/2015   22:43:00   (  -0.26,-135.16) (  -1.06,-138.86)  421.07                80
 10/01/2015   22:26:54   (  -0.27,-135.14) (  -0.07,-134.32)   94.14                80
 10/04/2015   10:27:13   (   0.26,-135.07) (   0.26,-135.04)    3.80                80