Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2017 7 19.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 07/21/2017   10:24:11   (  -0.19,-135.07) (  -0.18,-135.10)    3.83                80
 07/23/2017   22:27:23   (   0.21,-135.03) (   0.05,-135.88)   96.39                80
 07/24/2017   22:11:18   (   0.20,-135.00) (   1.03,-131.34)  417.06                80
 07/26/2017   10:30:25   (  -0.22,-134.91) (   0.14,-136.61)  193.38                80
 07/27/2017   10:14:19   (  -0.21,-134.87) (  -0.84,-132.07)  319.62                80
 07/28/2017   22:33:36   (   0.23,-134.85) (  -0.33,-137.37)  287.08                80
 07/29/2017   22:17:30   (   0.22,-134.82) (   0.66,-132.83)  225.99                80
 07/31/2017   10:36:38   (  -0.25,-134.73) (   0.52,-138.10)  384.53                80
 08/01/2017   10:20:32   (  -0.24,-134.68) (  -0.47,-133.56)  127.82                80