Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2017 12 9.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 12/09/2017   22:24:31   (   0.01,-135.36) (   0.21,-134.57)   91.23                80
 12/12/2017   10:27:33   (  -0.02,-135.45) (  -0.03,-135.30)   17.44                80
 12/14/2017   22:28:04   (   0.02,-135.38) (  -0.13,-136.07)   78.47                80
 12/15/2017   22:11:58   (   0.01,-135.38) (   0.86,-131.53)  438.38                80
 12/17/2017   10:31:07   (  -0.02,-135.46) (   0.25,-136.82)  153.95                80
 12/18/2017   10:15:01   (  -0.01,-135.46) (  -0.74,-132.28)  362.53                80
 12/19/2017   22:34:17   (   0.03,-135.37) (  -0.46,-137.58)  251.43                80
 12/20/2017   22:18:11   (   0.02,-135.37) (   0.53,-133.04)  264.60                80
 12/22/2017   10:37:18   (  -0.03,-135.43) (   0.64,-138.31)  328.96                80
 12/23/2017   10:21:14   (  -0.03,-135.42) (  -0.41,-133.79)  186.80                80