Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2017 12 4.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 12/04/2017   22:18:17   (  -0.01,-135.31) (   0.49,-133.04)  258.57                80
 12/06/2017   10:37:26   (  -0.01,-135.42) (   0.62,-138.33)  330.93                80
 12/07/2017   10:21:20   (   0.00,-135.43) (  -0.36,-133.79)  186.79                80
 12/08/2017   22:40:36   (   0.02,-135.35) (  -0.80,-139.10)  426.30                80
 12/09/2017   22:24:31   (   0.01,-135.36) (   0.19,-134.56)   91.32                80
 12/11/2017   10:43:38   (  -0.03,-135.46) (   0.98,-139.83)  498.57                80
 12/12/2017   10:27:34   (  -0.02,-135.47) (  -0.07,-135.31)   18.95                80
 12/14/2017   22:28:04   (   0.02,-135.39) (  -0.15,-136.07)   77.39                80
 12/15/2017   22:11:59   (   0.01,-135.40) (   0.90,-131.54)  439.70                80
 12/17/2017   10:31:06   (  -0.02,-135.49) (   0.28,-136.81)  151.29                80
 12/18/2017   10:15:01   (  -0.01,-135.49) (  -0.71,-132.28)  365.36                80