Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2017 9 24.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/25/2017   22:28:10   (  -0.28,-135.38) (  -0.39,-135.93)   62.99                80
 09/26/2017   22:12:06   (  -0.29,-135.39) (   0.60,-131.40)  454.45                80
 09/28/2017   10:33:55   (   0.27,-135.45) (   0.54,-136.68)  140.07                80
 09/29/2017   10:12:30   (   0.28,-135.45) (  -0.45,-132.14)  376.35                80
 09/30/2017   22:34:28   (  -0.26,-135.39) (  -0.73,-137.45)  234.84                80
 10/01/2017   22:18:23   (  -0.26,-135.39) (   0.27,-132.92)  281.86                80
 10/03/2017   10:40:13   (   0.24,-135.46) (   0.87,-138.19)  312.62                80
 10/04/2017   10:18:48   (   0.25,-135.45) (  -0.12,-133.66)  203.27                80
 10/05/2017   22:40:45   (  -0.23,-135.37) (  -1.05,-138.97)  410.05                80
 10/06/2017   22:24:41   (  -0.24,-135.37) (  -0.06,-134.43)  105.99                80