Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2017 9 15.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/15/2017   22:18:13   (  -0.32,-135.24) (   0.23,-132.89)  268.81                80
 09/17/2017   10:40:03   (   0.30,-135.31) (   0.92,-138.17)  325.32                80
 09/18/2017   10:18:38   (   0.31,-135.32) (  -0.06,-133.63)  192.71                80
 09/19/2017   22:40:35   (  -0.29,-135.31) (  -1.11,-138.94)  413.30                80
 09/20/2017   22:24:32   (  -0.30,-135.34) (  -0.07,-134.42)  105.37                80
 09/22/2017   10:46:21   (   0.28,-135.41) (   1.22,-139.69)  488.00                80
 09/23/2017   10:24:57   (   0.29,-135.42) (   0.23,-135.16)   29.72                80
 09/25/2017   22:28:10   (  -0.28,-135.40) (  -0.41,-135.93)   60.35                80
 09/26/2017   22:12:06   (  -0.29,-135.42) (   0.63,-131.41)  457.48                80
 09/28/2017   10:33:55   (   0.27,-135.48) (   0.51,-136.69)  136.93                80
 09/29/2017   10:12:31   (   0.28,-135.48) (  -0.48,-132.15)  379.89                80