Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2017 12 11.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 12/12/2017   10:27:33   (  -0.02,-135.46) (  -0.03,-135.30)   17.62                80
 12/14/2017   22:28:04   (   0.02,-135.38) (  -0.14,-136.07)   78.82                80
 12/15/2017   22:11:58   (   0.01,-135.38) (   0.85,-131.53)  437.99                80
 12/17/2017   10:31:07   (  -0.02,-135.46) (   0.26,-136.82)  154.07                80
 12/18/2017   10:15:01   (  -0.01,-135.46) (  -0.73,-132.28)  362.34                80
 12/19/2017   22:34:16   (   0.03,-135.37) (  -0.47,-137.58)  252.04                80
 12/20/2017   22:18:11   (   0.02,-135.36) (   0.52,-133.04)  263.95                80
 12/22/2017   10:37:19   (  -0.03,-135.43) (   0.59,-138.32)  329.33                80
 12/23/2017   10:21:14   (  -0.03,-135.42) (  -0.40,-133.79)  186.36                80
 12/24/2017   22:40:29   (   0.04,-135.32) (  -0.79,-139.09)  428.84                80