Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2015 9 13.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/14/2015   22:43:21   (  -0.33,-135.27) (  -1.11,-138.89)  411.73                80
 09/15/2015   22:27:15   (  -0.34,-135.28) (  -0.13,-134.35)  105.91                80
 09/17/2015   10:46:21   (   0.32,-135.27) (   1.28,-139.62)  496.13                80
 09/18/2015   10:27:35   (   0.33,-135.27) (   0.30,-135.08)   20.76                80
 09/20/2015   22:30:44   (  -0.32,-135.28) (  -0.46,-135.85)   65.63                80
 09/21/2015   22:14:38   (  -0.32,-135.28) (   0.58,-131.32)  450.86                80
 09/23/2015   10:33:43   (   0.30,-135.25) (   0.62,-136.58)  152.83                80
 09/24/2015   10:17:38   (   0.31,-135.24) (  -0.41,-132.06)  362.93                80
 09/25/2015   22:36:52   (  -0.28,-135.23) (  -0.78,-137.35)  242.10                80
 09/26/2015   22:20:47   (  -0.29,-135.22) (   0.26,-132.83)  273.74                80