Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2017 9 17.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/18/2017   10:18:38   (   0.31,-135.32) (  -0.07,-133.63)  192.53                80
 09/19/2017   22:40:36   (  -0.29,-135.31) (  -1.11,-138.94)  413.58                80
 09/20/2017   22:24:31   (  -0.30,-135.33) (  -0.12,-134.40)  105.01                80
 09/22/2017   10:46:20   (   0.28,-135.40) (   1.27,-139.68)  488.57                80
 09/23/2017   10:24:57   (   0.29,-135.41) (   0.23,-135.16)   29.08                80
 09/25/2017   22:28:10   (  -0.28,-135.40) (  -0.41,-135.93)   61.19                80
 09/26/2017   22:12:06   (  -0.29,-135.41) (   0.63,-131.41)  456.52                80
 09/28/2017   10:33:56   (   0.27,-135.47) (   0.52,-136.69)  138.11                80
 09/29/2017   10:12:31   (   0.28,-135.47) (  -0.47,-132.15)  378.62                80
 09/30/2017   22:34:28   (  -0.26,-135.43) (  -0.70,-137.46)  231.59                80