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   22:18:18   (  -0.01,-135.31) (   0.50,-133.05)  258.54                80
 12/06/2017   10:37:25   (  -0.01,-135.42) (   0.67,-138.32)  330.75                80
 12/07/2017   10:21:20   (   0.00,-135.43) (  -0.38,-133.79)  186.99                80
 12/08/2017   22:40:36   (   0.02,-135.35) (  -0.84,-139.09)  426.27                80
 12/09/2017   22:24:31   (   0.01,-135.36) (   0.21,-134.57)   91.38                80
 12/11/2017   10:43:38   (  -0.03,-135.47) (   0.96,-139.84)  498.35                80
 12/12/2017   10:27:34   (  -0.02,-135.47) (  -0.08,-135.31)   19.40                80
 12/14/2017   22:28:04   (   0.02,-135.40) (  -0.14,-136.07)   77.28                80
 12/15/2017   22:11:58   (   0.01,-135.40) (   0.85,-131.54)  439.78                80
 12/17/2017   10:31:07   (  -0.02,-135.49) (   0.26,-136.82)  151.04                80